20847912 has 16 divisors (see below), whose sum is σ = 52119840. Its totient is φ = 6949296.

The previous prime is 20847889. The next prime is 20847923. The reversal of 20847912 is 21974802.

It is a happy number.

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, 434308 + ... + 434355.

It is an arithmetic number, because the mean of its divisors is an integer number (3257490).

Almost surely, 2^20847912 is an apocalyptic number.

It is an amenable number.

20847912 is an abundant number, since it is smaller than the sum of its proper divisors (31271928).

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

20847912 is a wasteful number, since it uses less digits than its factorization.

20847912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868672 (or 868668 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20847912 is about 4565.9513795046. The cubic root of 20847912 is about 275.2247727046.

The spelling of 20847912 in words is "twenty million, eight hundred forty-seven thousand, nine hundred twelve".