20920453 has 4 divisors (see below), whose sum is σ = 20947500. Its totient is φ = 20893408.

The previous prime is 20920441. The next prime is 20920457. The reversal of 20920453 is 35402902.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13264164 + 7656289 = 3642^2 + 2767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20920453 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 (20920457) 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 3 ways as a sum of consecutive naturals, for example, 12328 + ... + 13921.

It is an arithmetic number, because the mean of its divisors is an integer number (5236875).

Almost surely, 2^20920453 is an apocalyptic number.

It is an amenable number.

20920453 is a deficient number, since it is larger than the sum of its proper divisors (27047).

20920453 is an equidigital number, since it uses as much as digits as its factorization.

20920453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27046.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20920453 is about 4573.8881709110. Note that the first 3 decimals coincide. The cubic root of 20920453 is about 275.5436210783.

The spelling of 20920453 in words is "twenty million, nine hundred twenty thousand, four hundred fifty-three".