20638719552 has 56 divisors (see below), whose sum is σ = 59570855712. Its totient is φ = 6254156800.

The previous prime is 20638719527. The next prime is 20638719599. The reversal of 20638719552 is 25591783602.

It is a super-2 number, since 2×20638719552² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 4883949 + ... + 4888172.

Almost surely, 2^20638719552 is an apocalyptic number.

20638719552 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20638719552 is an abundant number, since it is smaller than the sum of its proper divisors (38932136160).

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

20638719552 is a wasteful number, since it uses less digits than its factorization.

20638719552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9772147 (or 9772137 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 20638719552 in words is "twenty billion, six hundred thirty-eight million, seven hundred nineteen thousand, five hundred fifty-two".