20569456497 has 16 divisors (see below), whose sum is σ = 27593625600. Its totient is φ = 13629279312.

The previous prime is 20569456469. The next prime is 20569456513. The reversal of 20569456497 is 79465496502.

It is a de Polignac number, because none of the positive numbers 2^k-20569456497 is a prime.

It is a super-2 number, since 2×20569456497² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20569456417) 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, 547168 + ... + 583550.

It is an arithmetic number, because the mean of its divisors is an integer number (1724601600).

Almost surely, 2^20569456497 is an apocalyptic number.

It is an amenable number.

20569456497 is a deficient number, since it is larger than the sum of its proper divisors (7024169103).

20569456497 is a wasteful number, since it uses less digits than its factorization.

20569456497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37532.

The product of its (nonzero) digits is 16329600, while the sum is 57.

The spelling of 20569456497 in words is "twenty billion, five hundred sixty-nine million, four hundred fifty-six thousand, four hundred ninety-seven".