20313697 has 2 divisors, whose sum is σ = 20313698. Its totient is φ = 20313696.

The previous prime is 20313661. The next prime is 20313701. The reversal of 20313697 is 79631302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16329681 + 3984016 = 4041^2 + 1996^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313697 - 2⁷ = 20313569 is a prime.

It is equal to p_1289227 and since 20313697 and 1289227 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20313607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156848 + 10156849.

It is an arithmetic number, because the mean of its divisors is an integer number (10156849).

Almost surely, 2^20313697 is an apocalyptic number.

It is an amenable number.

20313697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313697 is an equidigital number, since it uses as much as digits as its factorization.

20313697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 20313697 is about 4507.0718876006. The cubic root of 20313697 is about 272.8535802386.

Adding to 20313697 its reverse (79631302), we get a palindrome (99944999).

The spelling of 20313697 in words is "twenty million, three hundred thirteen thousand, six hundred ninety-seven".