20992768 has 18 divisors (see below), whose sum is σ = 41904044. Its totient is φ = 10496256.

The previous prime is 20992757. The next prime is 20992771. The reversal of 20992768 is 86729902.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40746 + ... + 41257.

Almost surely, 2^20992768 is an apocalyptic number.

It is an amenable number.

20992768 is a deficient number, since it is larger than the sum of its proper divisors (20911276).

20992768 is an frugal number, since it uses more digits than its factorization.

20992768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82019 (or 82005 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 20992768 is about 4581.7865511174. The cubic root of 20992768 is about 275.8607433040.

The spelling of 20992768 in words is "twenty million, nine hundred ninety-two thousand, seven hundred sixty-eight".