20492021 has 8 divisors (see below), whose sum is σ = 23670144. Its totient is φ = 17533120.

The previous prime is 20491997. The next prime is 20492027. The reversal of 20492021 is 12029402.

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

It is not a de Polignac number, because 20492021 - 2⁶ = 20491957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20491984 and 20492002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20492027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54605 + ... + 54978.

It is an arithmetic number, because the mean of its divisors is an integer number (2958768).

Almost surely, 2^20492021 is an apocalyptic number.

It is an amenable number.

20492021 is a deficient number, since it is larger than the sum of its proper divisors (3178123).

20492021 is a wasteful number, since it uses less digits than its factorization.

20492021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109611.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20492021 is about 4526.8113501669. The cubic root of 20492021 is about 273.6496712609.

The spelling of 20492021 in words is "twenty million, four hundred ninety-two thousand, twenty-one".