[go: up one dir, main page]

Search a number
-
+
19794640 = 245247433
BaseRepresentation
bin100101110000…
…0101011010000
31101020200010211
41023200223100
520031412030
61544133504
7330152215
oct113405320
941220124
1019794640
11101a0008
126767294
134140b08
1428b3b0c
151b1012a
hex12e0ad0

19794640 has 20 divisors (see below), whose sum is σ = 46022724. Its totient is φ = 7917824.

The previous prime is 19794629. The next prime is 19794641. The reversal of 19794640 is 4649791.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9909904 + 9884736 = 3148^2 + 3144^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 19794593 and 19794602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19794641) 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, 123637 + ... + 123796.

Almost surely, 219794640 is an apocalyptic number.

19794640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19794640 is an abundant number, since it is smaller than the sum of its proper divisors (26228084).

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

19794640 is a wasteful number, since it uses less digits than its factorization.

19794640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247446 (or 247440 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 19794640 is about 4449.1167662807. The cubic root of 19794640 is about 270.5095088811.

The spelling of 19794640 in words is "nineteen million, seven hundred ninety-four thousand, six hundred forty".

Divisors: 1 2 4 5 8 10 16 20 40 80 247433 494866 989732 1237165 1979464 2474330 3958928 4948660 9897320 19794640