20992538 has 8 divisors (see below), whose sum is σ = 35987232. Its totient is φ = 8996796.

The previous prime is 20992529. The next prime is 20992553. The reversal of 20992538 is 83529902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749720 + ... + 749747.

It is an arithmetic number, because the mean of its divisors is an integer number (4498404).

Almost surely, 2^20992538 is an apocalyptic number.

20992538 is a deficient number, since it is larger than the sum of its proper divisors (14994694).

20992538 is a wasteful number, since it uses less digits than its factorization.

20992538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499476.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 20992538 is about 4581.7614516690. The cubic root of 20992538 is about 275.8597358427.

The spelling of 20992538 in words is "twenty million, nine hundred ninety-two thousand, five hundred thirty-eight".