20787757477630 has 384 divisors, whose sum is σ = 48802151946240. Its totient is φ = 6277796904960.

The previous prime is 20787757477601. The next prime is 20787757477649. The reversal of 20787757477630 is 3677475778702.

It is a hoax number, since the sum of its digits (70) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20787757477630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 835206226 + ... + 835231114.

It is an arithmetic number, because the mean of its divisors is an integer number (127088937360).

Almost surely, 2^{20787757477630} is an apocalyptic number.

20787757477630 is an abundant number, since it is smaller than the sum of its proper divisors (28014394468610).

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

20787757477630 is a wasteful number, since it uses less digits than its factorization.

20787757477630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25044 (or 25027 counting only the distinct ones).

The product of its (nonzero) digits is 677658240, while the sum is 70.

The spelling of 20787757477630 in words is "twenty trillion, seven hundred eighty-seven billion, seven hundred fifty-seven million, four hundred seventy-seven thousand, six hundred thirty".