20779001 has 2 divisors, whose sum is σ = 20779002. Its totient is φ = 20779000.

The previous prime is 20778991. The next prime is 20779007. The reversal of 20779001 is 10097702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 30976 = 4555^2 + 176^2 .

It is a cyclic number.

It is not a de Polignac number, because 20779001 - 2⁶ = 20778937 is a prime.

It is not a weakly prime, because it can be changed into another prime (20779007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389500 + 10389501.

It is an arithmetic number, because the mean of its divisors is an integer number (10389501).

Almost surely, 2^20779001 is an apocalyptic number.

It is an amenable number.

20779001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20779001 is an equidigital number, since it uses as much as digits as its factorization.

20779001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 20779001 is about 4558.3989513863. The cubic root of 20779001 is about 274.9211939478.

The spelling of 20779001 in words is "twenty million, seven hundred seventy-nine thousand, one".