20969756 has 6 divisors (see below), whose sum is σ = 36697080. Its totient is φ = 10484876.

The previous prime is 20969723. The next prime is 20969783. The reversal of 20969756 is 65796902.

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, 2621216 + ... + 2621223.

It is an arithmetic number, because the mean of its divisors is an integer number (6116180).

Almost surely, 2^20969756 is an apocalyptic number.

It is an amenable number.

20969756 is a deficient number, since it is larger than the sum of its proper divisors (15727324).

20969756 is a wasteful number, since it uses less digits than its factorization.

20969756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5242443 (or 5242441 counting only the distinct ones).

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

The square root of 20969756 is about 4579.2746150455. The cubic root of 20969756 is about 275.7599081273.

The spelling of 20969756 in words is "twenty million, nine hundred sixty-nine thousand, seven hundred fifty-six".