20253979 has 2 divisors, whose sum is σ = 20253980. Its totient is φ = 20253978.

The previous prime is 20253973. The next prime is 20254009. The reversal of 20253979 is 97935202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20253979 - 2³ = 20253971 is a prime.

It is not a weakly prime, because it can be changed into another prime (20253971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10126989 + 10126990.

It is an arithmetic number, because the mean of its divisors is an integer number (10126990).

Almost surely, 2^20253979 is an apocalyptic number.

20253979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20253979 is an equidigital number, since it uses as much as digits as its factorization.

20253979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 20253979 is about 4500.4420893952. The cubic root of 20253979 is about 272.5859404046.

The spelling of 20253979 in words is "twenty million, two hundred fifty-three thousand, nine hundred seventy-nine".