20787757478625 has 32 divisors (see below), whose sum is σ = 36411398375040. Its totient is φ = 10503287985600.

The previous prime is 20787757478603. The next prime is 20787757478693. The reversal of 20787757478625 is 52687475778702.

It is not a de Polignac number, because 20787757478625 - 2¹⁰ = 20787757477601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (75).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1458782874 + ... + 1458797123.

It is an arithmetic number, because the mean of its divisors is an integer number (1137856199220).

Almost surely, 2^{20787757478625} is an apocalyptic number.

20787757478625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20787757478625 is a deficient number, since it is larger than the sum of its proper divisors (15623640896415).

20787757478625 is a wasteful number, since it uses less digits than its factorization.

20787757478625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917580034 (or 2917580024 counting only the distinct ones).

The product of its (nonzero) digits is 2581555200, while the sum is 75.

The spelling of 20787757478625 in words is "twenty trillion, seven hundred eighty-seven billion, seven hundred fifty-seven million, four hundred seventy-eight thousand, six hundred twenty-five".