20257440015 has 16 divisors (see below), whose sum is σ = 32414738400. Its totient is φ = 10803023232.

The previous prime is 20257440001. The next prime is 20257440031. The reversal of 20257440015 is 51004475202.

It is not a de Polignac number, because 20257440015 - 2²⁸ = 19989004559 is a prime.

It is a super-2 number, since 2×20257440015² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139801 + ... + 245069.

It is an arithmetic number, because the mean of its divisors is an integer number (2025921150).

Almost surely, 2^20257440015 is an apocalyptic number.

20257440015 is a deficient number, since it is larger than the sum of its proper divisors (12157298385).

20257440015 is a wasteful number, since it uses less digits than its factorization.

20257440015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118106.

The product of its (nonzero) digits is 11200, while the sum is 30.

The spelling of 20257440015 in words is "twenty billion, two hundred fifty-seven million, four hundred forty thousand, fifteen".