20451912 has 32 divisors (see below), whose sum is σ = 55063680. Its totient is φ = 6292800.

The previous prime is 20451911. The next prime is 20451917. The reversal of 20451912 is 21915402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20451911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32464 + ... + 33087.

It is an arithmetic number, because the mean of its divisors is an integer number (1720740).

Almost surely, 2^20451912 is an apocalyptic number.

It is an amenable number.

20451912 is an abundant number, since it is smaller than the sum of its proper divisors (34611768).

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

20451912 is a wasteful number, since it uses less digits than its factorization.

20451912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65573 (or 65569 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 20451912 is about 4522.3790199407. The cubic root of 20451912 is about 273.4710166284.

The spelling of 20451912 in words is "twenty million, four hundred fifty-one thousand, nine hundred twelve".