20280108904 has 32 divisors (see below), whose sum is σ = 41784854400. Its totient is φ = 9150939520.

The previous prime is 20280108817. The next prime is 20280108917. The reversal of 20280108904 is 40980108202.

It is a super-2 number, since 2×20280108904² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20280108904.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 829024 + ... + 853135.

It is an arithmetic number, because the mean of its divisors is an integer number (1305776700).

Almost surely, 2^20280108904 is an apocalyptic number.

It is an amenable number.

20280108904 is an abundant number, since it is smaller than the sum of its proper divisors (21504745496).

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

20280108904 is a wasteful number, since it uses less digits than its factorization.

20280108904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682313 (or 1682309 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 20280108904 in words is "twenty billion, two hundred eighty million, one hundred eight thousand, nine hundred four".