20400612 has 24 divisors (see below), whose sum is σ = 50402016. Its totient is φ = 6400128.

The previous prime is 20400599. The next prime is 20400631. The reversal of 20400612 is 21600402.

20400612 is a modest number, since divided by 612 gives 204 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20400591 and 20400600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49798 + ... + 50205.

It is an arithmetic number, because the mean of its divisors is an integer number (2100084).

Almost surely, 2^20400612 is an apocalyptic number.

It is an amenable number.

20400612 is an abundant number, since it is smaller than the sum of its proper divisors (30001404).

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

20400612 is a wasteful number, since it uses less digits than its factorization.

20400612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100027 (or 100025 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20400612 is about 4516.7036652851. The cubic root of 20400612 is about 273.2421739765.

It can be divided in two parts, 20400 and 612, that added together give a palindrome (21012).

The spelling of 20400612 in words is "twenty million, four hundred thousand, six hundred twelve".