20260921 has 2 divisors, whose sum is σ = 20260922. Its totient is φ = 20260920.

The previous prime is 20260913. The next prime is 20260951. The reversal of 20260921 is 12906202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14714896 + 5546025 = 3836^2 + 2355^2 .

It is a cyclic number.

It is not a de Polignac number, because 20260921 - 2³ = 20260913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20260892 and 20260901.

It is not a weakly prime, because it can be changed into another prime (20260951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130460 + 10130461.

It is an arithmetic number, because the mean of its divisors is an integer number (10130461).

Almost surely, 2^20260921 is an apocalyptic number.

It is an amenable number.

20260921 is a deficient number, since it is larger than the sum of its proper divisors (1).

20260921 is an equidigital number, since it uses as much as digits as its factorization.

20260921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20260921 is about 4501.2132808833. The cubic root of 20260921 is about 272.6170795608.

The spelling of 20260921 in words is "twenty million, two hundred sixty thousand, nine hundred twenty-one".