20457317765715 has 16 divisors (see below), whose sum is σ = 33349287830688. Its totient is φ = 10704709673216.

The previous prime is 20457317765693. The next prime is 20457317765737. The reversal of 20457317765715 is 51756771375402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20457317765693) and next prime (20457317765737).

It is a cyclic number.

It is not a de Polignac number, because 20457317765715 - 2¹² = 20457317761619 is a prime.

It is a super-2 number, since 2×20457317765715² (a number of 27 digits) contains 22 as substring.

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, 12866236794 + ... + 12866238383.

It is an arithmetic number, because the mean of its divisors is an integer number (2084330489418).

Almost surely, 2^{20457317765715} is an apocalyptic number.

20457317765715 is a deficient number, since it is larger than the sum of its proper divisors (12891970064973).

20457317765715 is a wasteful number, since it uses less digits than its factorization.

20457317765715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25732475238.

The product of its (nonzero) digits is 43218000, while the sum is 60.

The spelling of 20457317765715 in words is "twenty trillion, four hundred fifty-seven billion, three hundred seventeen million, seven hundred sixty-five thousand, seven hundred fifteen".