20801138927136 has 48 divisors (see below), whose sum is σ = 54603224401824. Its totient is φ = 6933683170304.

The previous prime is 20801138927123. The next prime is 20801138927137. The reversal of 20801138927136 is 63172983110802.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×20801138927136² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20801138927137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43085995 + ... + 43566101.

It is an arithmetic number, because the mean of its divisors is an integer number (1137567175038).

Almost surely, 2^{20801138927136} is an apocalyptic number.

It is an amenable number.

20801138927136 is an abundant number, since it is smaller than the sum of its proper divisors (33802085474688).

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

20801138927136 is a wasteful number, since it uses less digits than its factorization.

20801138927136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931433 (or 931425 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 20801138927136 in words is "twenty trillion, eight hundred one billion, one hundred thirty-eight million, nine hundred twenty-seven thousand, one hundred thirty-six".