20787757477628 has 12 divisors (see below), whose sum is σ = 36380660559600. Its totient is φ = 10393283032032.

The previous prime is 20787757477601. The next prime is 20787757477649. The reversal of 20787757477628 is 82677475778702.

It is a hoax number, since the sum of its digits (77) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148848176 + ... + 148987767.

It is an arithmetic number, because the mean of its divisors is an integer number (3031721713300).

Almost surely, 2^{20787757477628} is an apocalyptic number.

It is an amenable number.

20787757477628 is a deficient number, since it is larger than the sum of its proper divisors (15592903081972).

20787757477628 is a wasteful number, since it uses less digits than its factorization.

20787757477628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297853396 (or 297853394 counting only the distinct ones).

The product of its (nonzero) digits is 3614177280, while the sum is 77.

The spelling of 20787757477628 in words is "twenty trillion, seven hundred eighty-seven billion, seven hundred fifty-seven million, four hundred seventy-seven thousand, six hundred twenty-eight".