20492893 has 6 divisors (see below), whose sum is σ = 20940446. Its totient is φ = 20054712.

The previous prime is 20492863. The next prime is 20492911. The reversal of 20492893 is 39829402.

It can be written as a sum of positive squares in only one way, i.e., 19518724 + 974169 = 4418^2 + 987^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20492893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20492863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2430 + ... + 6847.

Almost surely, 2^20492893 is an apocalyptic number.

It is an amenable number.

20492893 is a deficient number, since it is larger than the sum of its proper divisors (447553).

20492893 is an frugal number, since it uses more digits than its factorization.

20492893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9371 (or 9324 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 20492893 is about 4526.9076641787. The cubic root of 20492893 is about 273.6535527575.

The spelling of 20492893 in words is "twenty million, four hundred ninety-two thousand, eight hundred ninety-three".