20412799681 has 4 divisors (see below), whose sum is σ = 20461518000. Its totient is φ = 20364081364.

The previous prime is 20412799609. The next prime is 20412799697. The reversal of 20412799681 is 18699721402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20412799681 - 2²³ = 20404411073 is a prime.

It is a super-2 number, since 2×20412799681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20412797681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24358531 + ... + 24359368.

It is an arithmetic number, because the mean of its divisors is an integer number (5115379500).

Almost surely, 2^20412799681 is an apocalyptic number.

It is an amenable number.

20412799681 is a deficient number, since it is larger than the sum of its proper divisors (48718319).

20412799681 is an equidigital number, since it uses as much as digits as its factorization.

20412799681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48718318.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 20412799681 in words is "twenty billion, four hundred twelve million, seven hundred ninety-nine thousand, six hundred eighty-one".