20857622615 has 16 divisors (see below), whose sum is σ = 25367086656. Its totient is φ = 16461984000.

The previous prime is 20857622567. The next prime is 20857622627. The reversal of 20857622615 is 51622675802.

It is not a de Polignac number, because 20857622615 - 2¹⁰ = 20857621591 is a prime.

It is a super-2 number, since 2×20857622615² (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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68414 + ... + 215396.

It is an arithmetic number, because the mean of its divisors is an integer number (1585442916).

Almost surely, 2^20857622615 is an apocalyptic number.

20857622615 is a deficient number, since it is larger than the sum of its proper divisors (4509464041).

20857622615 is a wasteful number, since it uses less digits than its factorization.

20857622615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147370.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 20857622615 in words is "twenty billion, eight hundred fifty-seven million, six hundred twenty-two thousand, six hundred fifteen".