20997952 has 14 divisors (see below), whose sum is σ = 41667938. Its totient is φ = 10498944.

The previous prime is 20997937. The next prime is 20997961. The reversal of 20997952 is 25979902.

20997952 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in only one way, i.e., 15872256 + 5125696 = 3984^2 + 2264^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20997899 and 20997908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163983 + ... + 164110.

Almost surely, 2^20997952 is an apocalyptic number.

It is an amenable number.

20997952 is a deficient number, since it is larger than the sum of its proper divisors (20669986).

20997952 is an equidigital number, since it uses as much as digits as its factorization.

20997952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328105 (or 328095 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 20997952 is about 4582.3522343879. The cubic root of 20997952 is about 275.8834486533.

The spelling of 20997952 in words is "twenty million, nine hundred ninety-seven thousand, nine hundred fifty-two".