20621752138460 has 24 divisors (see below), whose sum is σ = 47242559444976. Its totient is φ = 7498818959360.

The previous prime is 20621752138457. The next prime is 20621752138499. The reversal of 20621752138460 is 6483125712602.

It is a super-2 number, since 2×20621752138460² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 46867618277 + ... + 46867618716.

It is an arithmetic number, because the mean of its divisors is an integer number (1968439976874).

Almost surely, 2^{20621752138460} is an apocalyptic number.

20621752138460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20621752138460 is an abundant number, since it is smaller than the sum of its proper divisors (26620807306516).

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

20621752138460 is a wasteful number, since it uses less digits than its factorization.

20621752138460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93735237013 (or 93735237011 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 20621752138460 in words is "twenty trillion, six hundred twenty-one billion, seven hundred fifty-two million, one hundred thirty-eight thousand, four hundred sixty".