20420408824 has 32 divisors (see below), whose sum is σ = 38613783600. Its totient is φ = 10123591680.

The previous prime is 20420408819. The next prime is 20420408843. The reversal of 20420408824 is 42880402402.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20420408824.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 874744 + ... + 897784.

Almost surely, 2^20420408824 is an apocalyptic number.

It is an amenable number.

20420408824 is a deficient number, since it is larger than the sum of its proper divisors (18193374776).

20420408824 is a wasteful number, since it uses less digits than its factorization.

20420408824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23983 (or 23979 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 34.

The spelling of 20420408824 in words is "twenty billion, four hundred twenty million, four hundred eight thousand, eight hundred twenty-four".