20967956 has 6 divisors (see below), whose sum is σ = 36693930. Its totient is φ = 10483976.

The previous prime is 20967949. The next prime is 20967971. The reversal of 20967956 is 65976902.

It can be written as a sum of positive squares in only one way, i.e., 13764100 + 7203856 = 3710^2 + 2684^2 .

It is a super-3 number, since 3×20967956³ (a number of 23 digits) contains 333 as substring.

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, 2620991 + ... + 2620998.

It is an arithmetic number, because the mean of its divisors is an integer number (6115655).

Almost surely, 2^20967956 is an apocalyptic number.

It is an amenable number.

20967956 is a deficient number, since it is larger than the sum of its proper divisors (15725974).

20967956 is a wasteful number, since it uses less digits than its factorization.

20967956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5241993 (or 5241991 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 20967956 is about 4579.0780731497. The cubic root of 20967956 is about 275.7520176836.

The spelling of 20967956 in words is "twenty million, nine hundred sixty-seven thousand, nine hundred fifty-six".