20879401 has 2 divisors, whose sum is σ = 20879402. Its totient is φ = 20879400.

The previous prime is 20879389. The next prime is 20879431. The reversal of 20879401 is 10497802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 853776 = 4475^2 + 924^2 .

It is a cyclic number.

It is not a de Polignac number, because 20879401 - 2⁹ = 20878889 is a prime.

It is a super-2 number, since 2×20879401² = 871898772237602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20879431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10439700 + 10439701.

It is an arithmetic number, because the mean of its divisors is an integer number (10439701).

Almost surely, 2^20879401 is an apocalyptic number.

It is an amenable number.

20879401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20879401 is an equidigital number, since it uses as much as digits as its factorization.

20879401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20879401 is about 4569.3983192539. The cubic root of 20879401 is about 275.3632708775.

The spelling of 20879401 in words is "twenty million, eight hundred seventy-nine thousand, four hundred one".