20157512507 has 4 divisors (see below), whose sum is σ = 21990013656. Its totient is φ = 18325011360.

The previous prime is 20157512477. The next prime is 20157512513. The reversal of 20157512507 is 70521575102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20157512507 - 2¹⁴ = 20157496123 is a prime.

It is a super-2 number, since 2×20157512507² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20157512597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 916250558 + ... + 916250579.

It is an arithmetic number, because the mean of its divisors is an integer number (5497503414).

Almost surely, 2^20157512507 is an apocalyptic number.

20157512507 is a deficient number, since it is larger than the sum of its proper divisors (1832501149).

20157512507 is a wasteful number, since it uses less digits than its factorization.

20157512507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832501148.

The product of its (nonzero) digits is 24500, while the sum is 35.

The spelling of 20157512507 in words is "twenty billion, one hundred fifty-seven million, five hundred twelve thousand, five hundred seven".