20757557975 has 24 divisors (see below), whose sum is σ = 32090648448. Its totient is φ = 12939775200.

The previous prime is 20757557929. The next prime is 20757557981. The reversal of 20757557975 is 57975575702.

It is not a de Polignac number, because 20757557975 - 2¹⁰ = 20757556951 is a prime.

It is a super-2 number, since 2×20757557975² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5389649 + ... + 5393498.

It is an arithmetic number, because the mean of its divisors is an integer number (1337110352).

Almost surely, 2^20757557975 is an apocalyptic number.

20757557975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20757557975 is a deficient number, since it is larger than the sum of its proper divisors (11333090473).

20757557975 is a wasteful number, since it uses less digits than its factorization.

20757557975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10783175 (or 10783170 counting only the distinct ones).

The product of its (nonzero) digits is 27011250, while the sum is 59.

The spelling of 20757557975 in words is "twenty billion, seven hundred fifty-seven million, five hundred fifty-seven thousand, nine hundred seventy-five".