20996956 has 6 divisors (see below), whose sum is σ = 36744680. Its totient is φ = 10498476.

The previous prime is 20996893. The next prime is 20996959. The reversal of 20996956 is 65969902.

It is a super-2 number, since 2×20996956² = 881744322531872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20996959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2624616 + ... + 2624623.

Almost surely, 2^20996956 is an apocalyptic number.

It is an amenable number.

20996956 is a deficient number, since it is larger than the sum of its proper divisors (15747724).

20996956 is a wasteful number, since it uses less digits than its factorization.

20996956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5249243 (or 5249241 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 20996956 is about 4582.2435552904. The cubic root of 20996956 is about 275.8790865730.

It can be divided in two parts, 20996 and 956, that added together give a cube (21952 = 28³).

The spelling of 20996956 in words is "twenty million, nine hundred ninety-six thousand, nine hundred fifty-six".