20200979 has 2 divisors, whose sum is σ = 20200980. Its totient is φ = 20200978.

The previous prime is 20200967. The next prime is 20200993. The reversal of 20200979 is 97900202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20200979 - 2⁴ = 20200963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20200679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100489 + 10100490.

It is an arithmetic number, because the mean of its divisors is an integer number (10100490).

Almost surely, 2^20200979 is an apocalyptic number.

20200979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200979 is an equidigital number, since it uses as much as digits as its factorization.

20200979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 20200979 is about 4494.5499218498. The cubic root of 20200979 is about 272.3479678276.

The spelling of 20200979 in words is "twenty million, two hundred thousand, nine hundred seventy-nine".