20407912 has 48 divisors (see below), whose sum is σ = 45144000. Its totient is φ = 8622432.

The previous prime is 20407903. The next prime is 20407921. The reversal of 20407912 is 21970402.

It is an interprime number because it is at equal distance from previous prime (20407903) and next prime (20407921).

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 11 ways as a sum of consecutive naturals, for example, 30639 + ... + 31297.

It is an arithmetic number, because the mean of its divisors is an integer number (940500).

Almost surely, 2^20407912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20407912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22572000).

20407912 is an abundant number, since it is smaller than the sum of its proper divisors (24736088).

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

20407912 is a wasteful number, since it uses less digits than its factorization.

20407912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20407912 is about 4517.5117044674. The cubic root of 20407912 is about 273.2747617244.

The spelling of 20407912 in words is "twenty million, four hundred seven thousand, nine hundred twelve".