20910772 has 24 divisors (see below), whose sum is σ = 39223296. Its totient is φ = 9728928.

The previous prime is 20910761. The next prime is 20910787. The reversal of 20910772 is 27701902.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20910772.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 333 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (1634304).

Almost surely, 2^20910772 is an apocalyptic number.

It is an amenable number.

20910772 is a deficient number, since it is larger than the sum of its proper divisors (18312524).

20910772 is a wasteful number, since it uses less digits than its factorization.

20910772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6207 (or 6205 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20910772 is about 4572.8297584756. The cubic root of 20910772 is about 275.5011116519.

The spelling of 20910772 in words is "twenty million, nine hundred ten thousand, seven hundred seventy-two".