20209638528 has 96 divisors (see below), whose sum is σ = 60683912640. Its totient is φ = 6443644416.

The previous prime is 20209638517. The next prime is 20209638541. The reversal of 20209638528 is 82583690202.

It is a happy number.

20209638528 is a `hidden beast` number, since 2 + 0 + 2 + 0 + 9 + 638 + 5 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 354876 + ... + 407867.

It is an arithmetic number, because the mean of its divisors is an integer number (632124090).

Almost surely, 2^20209638528 is an apocalyptic number.

It is an amenable number.

20209638528 is an abundant number, since it is smaller than the sum of its proper divisors (40474274112).

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

20209638528 is a wasteful number, since it uses less digits than its factorization.

20209638528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762786 (or 762771 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 20209638528 in words is "twenty billion, two hundred nine million, six hundred thirty-eight thousand, five hundred twenty-eight".