20621149776 has 50 divisors (see below), whose sum is σ = 59683593882. Its totient is φ = 6873716160.

The previous prime is 20621149729. The next prime is 20621149777. The reversal of 20621149776 is 67794112602.

20621149776 is a `hidden beast` number, since 2 + 0 + 621 + 14 + 9 + 7 + 7 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17265960000 + 3355189776 = 131400^2 + 57924^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20621149777) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7954395 + ... + 7956986.

Almost surely, 2^20621149776 is an apocalyptic number.

It is an amenable number.

20621149776 is an abundant number, since it is smaller than the sum of its proper divisors (39062444106).

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

20621149776 is a wasteful number, since it uses less digits than its factorization.

20621149776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15911401 (or 15911386 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 20621149776 in words is "twenty billion, six hundred twenty-one million, one hundred forty-nine thousand, seven hundred seventy-six".