20520106904 has 32 divisors (see below), whose sum is σ = 44441946000. Its totient is φ = 8778654720.

The previous prime is 20520106889. The next prime is 20520106973. The reversal of 20520106904 is 40960102502.

It is a happy number.

It is a congruent number.

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, 6856829 + ... + 6859820.

Almost surely, 2^20520106904 is an apocalyptic number.

It is an amenable number.

20520106904 is an abundant number, since it is smaller than the sum of its proper divisors (23921839096).

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

20520106904 is a wasteful number, since it uses less digits than its factorization.

20520106904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13716683 (or 13716679 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 20520106904 in words is "twenty billion, five hundred twenty million, one hundred six thousand, nine hundred four".