20314981 has 2 divisors, whose sum is σ = 20314982. Its totient is φ = 20314980.

The previous prime is 20314969. The next prime is 20315011. The reversal of 20314981 is 18941302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18792225 + 1522756 = 4335^2 + 1234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20314981 is a prime.

It is a super-2 number, since 2×20314981² = 825396906060722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20314081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157490 + 10157491.

It is an arithmetic number, because the mean of its divisors is an integer number (10157491).

Almost surely, 2^20314981 is an apocalyptic number.

It is an amenable number.

20314981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20314981 is an equidigital number, since it uses as much as digits as its factorization.

20314981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20314981 is about 4507.2143281632. The cubic root of 20314981 is about 272.8593290135.

The spelling of 20314981 in words is "twenty million, three hundred fourteen thousand, nine hundred eighty-one".