20992424 has 8 divisors (see below), whose sum is σ = 39360810. Its totient is φ = 10496208.

The previous prime is 20992421. The next prime is 20992427. The reversal of 20992424 is 42429902.

It is an interprime number because it is at equal distance from previous prime (20992421) and next prime (20992427).

It can be written as a sum of positive squares in only one way, i.e., 18335524 + 2656900 = 4282^2 + 1630^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20992421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1312019 + ... + 1312034.

Almost surely, 2^20992424 is an apocalyptic number.

It is an amenable number.

20992424 is a deficient number, since it is larger than the sum of its proper divisors (18368386).

20992424 is a wasteful number, since it uses less digits than its factorization.

20992424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624059 (or 2624055 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20992424 is about 4581.7490110219. The cubic root of 20992424 is about 275.8592364896.

The spelling of 20992424 in words is "twenty million, nine hundred ninety-two thousand, four hundred twenty-four".