20492751 has 4 divisors (see below), whose sum is σ = 27323672. Its totient is φ = 13661832.

The previous prime is 20492741. The next prime is 20492753. The reversal of 20492751 is 15729402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20492751 - 2⁹ = 20492239 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 (20492753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3415456 + ... + 3415461.

It is an arithmetic number, because the mean of its divisors is an integer number (6830918).

Almost surely, 2^20492751 is an apocalyptic number.

20492751 is a deficient number, since it is larger than the sum of its proper divisors (6830921).

20492751 is an equidigital number, since it uses as much as digits as its factorization.

20492751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6830920.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20492751 is about 4526.8919801559. The cubic root of 20492751 is about 273.6529206864.

The spelling of 20492751 in words is "twenty million, four hundred ninety-two thousand, seven hundred fifty-one".