20801637228015 has 96 divisors (see below), whose sum is σ = 45548843348160. Its totient is φ = 8949948069888.

The previous prime is 20801637228013. The next prime is 20801637228061. The reversal of 20801637228015 is 51082273610802.

20801637228015 is a `hidden beast` number, since 2 + 0 + 8 + 0 + 1 + 637 + 2 + 2 + 8 + 0 + 1 + 5 = 666.

It is not a de Polignac number, because 20801637228015 - 2¹ = 20801637228013 is a prime.

It is a super-2 number, since 2×20801637228015² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20801637228013) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 92376262 + ... + 92601171.

It is an arithmetic number, because the mean of its divisors is an integer number (474467118210).

Almost surely, 2^{20801637228015} is an apocalyptic number.

20801637228015 is an abundant number, since it is smaller than the sum of its proper divisors (24747206120145).

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

20801637228015 is a wasteful number, since it uses less digits than its factorization.

20801637228015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184977478 (or 184977465 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 20801637228015 in words is "twenty trillion, eight hundred one billion, six hundred thirty-seven million, two hundred twenty-eight thousand, fifteen".