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1305025220 = 22565251261
BaseRepresentation
bin100110111001001…
…0001101011000100
310100221122011001102
41031302101223010
510133041301340
6333255115232
744224350152
oct11562215304
93327564042
101305025220
1160a71a844
12305072b18
1317a4a7395
14c546c3d2
1579884215
hex4dc91ac4

1305025220 has 12 divisors (see below), whose sum is σ = 2740553004. Its totient is φ = 522010080.

The previous prime is 1305025217. The next prime is 1305025229. The reversal of 1305025220 is 225205031.

It can be written as a sum of positive squares in 2 ways, for example, as 436308544 + 868716676 = 20888^2 + 29474^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 65251261 = 1305025220 / (1 + 3 + 0 + 5 + 0 + 2 + 5 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1305025192 and 1305025201.

It is not an unprimeable number, because it can be changed into a prime (1305025229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32625611 + ... + 32625650.

It is an arithmetic number, because the mean of its divisors is an integer number (228379417).

Almost surely, 21305025220 is an apocalyptic number.

1305025220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305025220 is an abundant number, since it is smaller than the sum of its proper divisors (1435527784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1305025220 is a wasteful number, since it uses less digits than its factorization.

1305025220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65251270 (or 65251268 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 1305025220 is about 36125.1328025241. The cubic root of 1305025220 is about 1092.7973542452.

The spelling of 1305025220 in words is "one billion, three hundred five million, twenty-five thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 65251261 130502522 261005044 326256305 652512610 1305025220