20313961 has 2 divisors, whose sum is σ = 20313962. Its totient is φ = 20313960.

The previous prime is 20313941. The next prime is 20313967. The reversal of 20313961 is 16931302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16152361 + 4161600 = 4019^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313961 - 2¹⁷ = 20182889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20313967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156980 + 10156981.

It is an arithmetic number, because the mean of its divisors is an integer number (10156981).

Almost surely, 2^20313961 is an apocalyptic number.

It is an amenable number.

20313961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313961 is an equidigital number, since it uses as much as digits as its factorization.

20313961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20313961 is about 4507.1011748129. The cubic root of 20313961 is about 272.8547622495.

The spelling of 20313961 in words is "twenty million, three hundred thirteen thousand, nine hundred sixty-one".