20570247531 has 24 divisors (see below), whose sum is σ = 29966636544. Its totient is φ = 13596387840.

The previous prime is 20570247497. The next prime is 20570247589. The reversal of 20570247531 is 13574207502.

It is not a de Polignac number, because 20570247531 - 2²² = 20566053227 is a prime.

It is a super-2 number, since 2×20570247531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20570207531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1984795 + ... + 1995131.

It is an arithmetic number, because the mean of its divisors is an integer number (1248609856).

Almost surely, 2^20570247531 is an apocalyptic number.

20570247531 is a deficient number, since it is larger than the sum of its proper divisors (9396389013).

20570247531 is a wasteful number, since it uses less digits than its factorization.

20570247531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12211 (or 12208 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The spelling of 20570247531 in words is "twenty billion, five hundred seventy million, two hundred forty-seven thousand, five hundred thirty-one".