20907439457136 has 40 divisors (see below), whose sum is σ = 56359184626560. Its totient is φ = 6666140116416.

The previous prime is 20907439457123. The next prime is 20907439457141. The reversal of 20907439457136 is 63175493470902.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20907439457136.

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, 9468947926 + ... + 9468950133.

It is an arithmetic number, because the mean of its divisors is an integer number (1408979615664).

Almost surely, 2^{20907439457136} is an apocalyptic number.

It is an amenable number.

20907439457136 is an abundant number, since it is smaller than the sum of its proper divisors (35451745169424).

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

20907439457136 is a wasteful number, since it uses less digits than its factorization.

20907439457136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18937898093 (or 18937898087 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 60.

The spelling of 20907439457136 in words is "twenty trillion, nine hundred seven billion, four hundred thirty-nine million, four hundred fifty-seven thousand, one hundred thirty-six".