20901602661552 has 120 divisors (see below), whose sum is σ = 61643591343360. Its totient is φ = 6593063955840.

The previous prime is 20901602661539. The next prime is 20901602661617. The reversal of 20901602661552 is 25516620610902.

20901602661552 is a `hidden beast` number, since 2 + 0 + 9 + 0 + 1 + 6 + 0 + 26 + 615 + 5 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20901602661498 and 20901602661507.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1879524 + ... + 6733187.

It is an arithmetic number, because the mean of its divisors is an integer number (513696594528).

Almost surely, 2^{20901602661552} is an apocalyptic number.

It is an amenable number.

20901602661552 is an abundant number, since it is smaller than the sum of its proper divisors (40741988681808).

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

20901602661552 is a wasteful number, since it uses less digits than its factorization.

20901602661552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8613631 (or 8613622 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 20901602661552 in words is "twenty trillion, nine hundred one billion, six hundred two million, six hundred sixty-one thousand, five hundred fifty-two".