20787757477422 has 64 divisors (see below), whose sum is σ = 44972262720000. Its totient is φ = 6367891252608.

The previous prime is 20787757477397. The next prime is 20787757477429. The reversal of 20787757477422 is 22477475778702.

It is a super-2 number, since 2×20787757477422² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787757477429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28999729 + ... + 29707907.

It is an arithmetic number, because the mean of its divisors is an integer number (702691605000).

Almost surely, 2^{20787757477422} is an apocalyptic number.

20787757477422 is an abundant number, since it is smaller than the sum of its proper divisors (24184505242578).

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

20787757477422 is a wasteful number, since it uses less digits than its factorization.

20787757477422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709865.

The product of its (nonzero) digits is 602362880, while the sum is 69.

The spelling of 20787757477422 in words is "twenty trillion, seven hundred eighty-seven billion, seven hundred fifty-seven million, four hundred seventy-seven thousand, four hundred twenty-two".