20951764 has 6 divisors (see below), whose sum is σ = 36665594. Its totient is φ = 10475880.

The previous prime is 20951761. The next prime is 20951767. The reversal of 20951764 is 46715902.

It is an interprime number because it is at equal distance from previous prime (20951761) and next prime (20951767).

It can be written as a sum of positive squares in only one way, i.e., 20775364 + 176400 = 4558^2 + 420^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20951761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2618967 + ... + 2618974.

Almost surely, 2^20951764 is an apocalyptic number.

It is an amenable number.

20951764 is a deficient number, since it is larger than the sum of its proper divisors (15713830).

20951764 is a wasteful number, since it uses less digits than its factorization.

20951764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5237945 (or 5237943 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20951764 is about 4577.3096902001. The cubic root of 20951764 is about 275.6810184489.

The spelling of 20951764 in words is "twenty million, nine hundred fifty-one thousand, seven hundred sixty-four".