20499629181 has 16 divisors (see below), whose sum is σ = 28134211584. Its totient is φ = 13270312944.

The previous prime is 20499629179. The next prime is 20499629203. The reversal of 20499629181 is 18192699402.

It is not a de Polignac number, because 20499629181 - 2¹ = 20499629179 is a prime.

It is a super-2 number, since 2×20499629181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20499629081) 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, 554485 + ... + 590298.

It is an arithmetic number, because the mean of its divisors is an integer number (1758388224).

Almost surely, 2^20499629181 is an apocalyptic number.

It is an amenable number.

20499629181 is a deficient number, since it is larger than the sum of its proper divisors (7634582403).

20499629181 is a wasteful number, since it uses less digits than its factorization.

20499629181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144960.

The product of its (nonzero) digits is 559872, while the sum is 51.

The spelling of 20499629181 in words is "twenty billion, four hundred ninety-nine million, six hundred twenty-nine thousand, one hundred eighty-one".