20230981 has 2 divisors, whose sum is σ = 20230982. Its totient is φ = 20230980.

The previous prime is 20230967. The next prime is 20230997. The reversal of 20230981 is 18903202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14130081 + 6100900 = 3759^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 20230981 - 2⁵ = 20230949 is a prime.

It is a super-2 number, since 2×20230981² = 818585184444722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20230381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10115490 + 10115491.

It is an arithmetic number, because the mean of its divisors is an integer number (10115491).

Almost surely, 2^20230981 is an apocalyptic number.

It is an amenable number.

20230981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20230981 is an equidigital number, since it uses as much as digits as its factorization.

20230981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20230981 is about 4497.8862813548. The cubic root of 20230981 is about 272.4827293153.

The spelling of 20230981 in words is "twenty million, two hundred thirty thousand, nine hundred eighty-one".