20427181808 has 40 divisors (see below), whose sum is σ = 45448043520. Its totient is φ = 8796392640.

The previous prime is 20427181799. The next prime is 20427181811. The reversal of 20427181808 is 80818172402.

It is a super-2 number, since 2×20427181808² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3050960 + ... + 3057647.

It is an arithmetic number, because the mean of its divisors is an integer number (1136201088).

Almost surely, 2^20427181808 is an apocalyptic number.

It is an amenable number.

20427181808 is an abundant number, since it is smaller than the sum of its proper divisors (25020861712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20427181808 is a wasteful number, since it uses less digits than its factorization.

20427181808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108645 (or 6108639 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 41.

The spelling of 20427181808 in words is "twenty billion, four hundred twenty-seven million, one hundred eighty-one thousand, eight hundred eight".