20995912 has 48 divisors (see below), whose sum is σ = 48222000. Its totient is φ = 8521632.

The previous prime is 20995903. The next prime is 20995939. The reversal of 20995912 is 21959902.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6039 + ... + 8857.

It is an arithmetic number, because the mean of its divisors is an integer number (1004625).

Almost surely, 2^20995912 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 20995912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24111000).

20995912 is an abundant number, since it is smaller than the sum of its proper divisors (27226088).

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

20995912 is a wasteful number, since it uses less digits than its factorization.

20995912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858 (or 2847 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 20995912 is about 4582.1296358789. The cubic root of 20995912 is about 275.8745141239.

The spelling of 20995912 in words is "twenty million, nine hundred ninety-five thousand, nine hundred twelve".