20604621521808 has 30 divisors (see below), whose sum is σ = 57664322731574. Its totient is φ = 6868207173888.

The previous prime is 20604621521807. The next prime is 20604621521837. The reversal of 20604621521808 is 80812512640602.

20604621521808 is a `hidden beast` number, since 2 + 0 + 6 + 0 + 4 + 621 + 5 + 2 + 18 + 0 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19752086926224 + 852534595584 = 4444332^2 + 923328^2 .

It is not an unprimeable number, because it can be changed into a prime (20604621521807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71543824585 + ... + 71543824872.

Almost surely, 2^{20604621521808} is an apocalyptic number.

It is an amenable number.

20604621521808 is an abundant number, since it is smaller than the sum of its proper divisors (37059701209766).

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

20604621521808 is a wasteful number, since it uses less digits than its factorization.

20604621521808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143087649471 (or 143087649462 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 20604621521808 in words is "twenty trillion, six hundred four billion, six hundred twenty-one million, five hundred twenty-one thousand, eight hundred eight".