20459293257 has 16 divisors (see below), whose sum is σ = 29574619200. Its totient is φ = 12505831872.

The previous prime is 20459293249. The next prime is 20459293277. The reversal of 20459293257 is 75239295402.

It is not a de Polignac number, because 20459293257 - 2³ = 20459293249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20459293207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1754583 + ... + 1766204.

It is an arithmetic number, because the mean of its divisors is an integer number (1848413700).

Almost surely, 2^20459293257 is an apocalyptic number.

It is an amenable number.

20459293257 is a deficient number, since it is larger than the sum of its proper divisors (9115325943).

20459293257 is a wasteful number, since it uses less digits than its factorization.

20459293257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520952.

The product of its (nonzero) digits is 1360800, while the sum is 48.

The spelling of 20459293257 in words is "twenty billion, four hundred fifty-nine million, two hundred ninety-three thousand, two hundred fifty-seven".