20696992 has 12 divisors (see below), whose sum is σ = 40747266. Its totient is φ = 10348480.

The previous prime is 20696989. The next prime is 20696993. The reversal of 20696992 is 29969602.

It can be written as a sum of positive squares in only one way, i.e., 16353936 + 4343056 = 4044^2 + 2084^2 .

It is not an unprimeable number, because it can be changed into a prime (20696993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323359 + ... + 323422.

Almost surely, 2^20696992 is an apocalyptic number.

It is an amenable number.

20696992 is a deficient number, since it is larger than the sum of its proper divisors (20050274).

20696992 is an equidigital number, since it uses as much as digits as its factorization.

20696992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646791 (or 646783 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 20696992 is about 4549.3946850103. The cubic root of 20696992 is about 274.5590376477.

The spelling of 20696992 in words is "twenty million, six hundred ninety-six thousand, nine hundred ninety-two".