20412805569 has 16 divisors (see below), whose sum is σ = 30256203264. Its totient is φ = 12156508800.

The previous prime is 20412805559. The next prime is 20412805619. The reversal of 20412805569 is 96550821402.

It is not a de Polignac number, because 20412805569 - 2⁵ = 20412805537 is a prime.

It is a super-2 number, since 2×20412805569² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20412805569.

It is not an unprimeable number, because it can be changed into a prime (20412805549) 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, 8440812 + ... + 8443229.

It is an arithmetic number, because the mean of its divisors is an integer number (1891012704).

Almost surely, 2^20412805569 is an apocalyptic number.

It is an amenable number.

20412805569 is a deficient number, since it is larger than the sum of its proper divisors (9843397695).

20412805569 is a wasteful number, since it uses less digits than its factorization.

20412805569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16884088.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 20412805569 in words is "twenty billion, four hundred twelve million, eight hundred five thousand, five hundred sixty-nine".