20400024620 has 12 divisors (see below), whose sum is σ = 42840051744. Its totient is φ = 8160009840.

The previous prime is 20400024581. The next prime is 20400024643. The reversal of 20400024620 is 2642000402.

It is a super-2 number, since 2×20400024620² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1020001231 = 20400024620 / (2 + 0 + 4 + 0 + 0 + 0 + 2 + 4 + 6 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 20400024592 and 20400024601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510000596 + ... + 510000635.

It is an arithmetic number, because the mean of its divisors is an integer number (3570004312).

Almost surely, 2^20400024620 is an apocalyptic number.

20400024620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400024620 is an abundant number, since it is smaller than the sum of its proper divisors (22440027124).

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

20400024620 is a wasteful number, since it uses less digits than its factorization.

20400024620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020001240 (or 1020001238 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The spelling of 20400024620 in words is "twenty billion, four hundred million, twenty-four thousand, six hundred twenty".