20787757477958 has 16 divisors (see below), whose sum is σ = 31373225147760. Its totient is φ = 10330016943456.

The previous prime is 20787757477957. The next prime is 20787757477969. The reversal of 20787757477958 is 85977475778702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787757477957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46145108 + ... + 46593416.

It is an arithmetic number, because the mean of its divisors is an integer number (1960826571735).

Almost surely, 2^{20787757477958} is an apocalyptic number.

20787757477958 is a deficient number, since it is larger than the sum of its proper divisors (10585467669802).

20787757477958 is a wasteful number, since it uses less digits than its factorization.

20787757477958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590711.

The product of its (nonzero) digits is 13553164800, while the sum is 83.

The spelling of 20787757477958 in words is "twenty trillion, seven hundred eighty-seven billion, seven hundred fifty-seven million, four hundred seventy-seven thousand, nine hundred fifty-eight".