20102880 has 192 divisors, whose sum is σ = 75091968. Its totient is φ = 4423680.

The previous prime is 20102861. The next prime is 20102899. The reversal of 20102880 is 8820102.

It is an interprime number because it is at equal distance from previous prime (20102861) and next prime (20102899).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104064 + ... + 104256.

It is an arithmetic number, because the mean of its divisors is an integer number (391104).

Almost surely, 2^20102880 is an apocalyptic number.

20102880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20102880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37545984).

20102880 is an abundant number, since it is smaller than the sum of its proper divisors (54989088).

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

20102880 is a wasteful number, since it uses less digits than its factorization.

20102880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 20102880 is about 4483.6235345979. The cubic root of 20102880 is about 271.9063980121.

Adding to 20102880 its reverse (8820102), we get a palindrome (28922982).

The spelling of 20102880 in words is "twenty million, one hundred two thousand, eight hundred eighty".