20947892 has 18 divisors (see below), whose sum is σ = 42644322. Its totient is φ = 8977584.

The previous prime is 20947873. The next prime is 20947903. The reversal of 20947892 is 29874902.

It can be written as a sum of positive squares in only one way, i.e., 19324816 + 1623076 = 4396^2 + 1274^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53243 + ... + 53634.

It is an arithmetic number, because the mean of its divisors is an integer number (2369129).

Almost surely, 2^20947892 is an apocalyptic number.

It is an amenable number.

20947892 is an abundant number, since it is smaller than the sum of its proper divisors (21696430).

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

20947892 is a wasteful number, since it uses less digits than its factorization.

20947892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106895 (or 106886 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20947892 is about 4576.8867147877. The cubic root of 20947892 is about 275.6640349519.

The spelling of 20947892 in words is "twenty million, nine hundred forty-seven thousand, eight hundred ninety-two".