20852981 has 2 divisors, whose sum is σ = 20852982. Its totient is φ = 20852980.

The previous prime is 20852977. The next prime is 20853023. The reversal of 20852981 is 18925802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15288100 + 5564881 = 3910^2 + 2359^2 .

It is a cyclic number.

It is not a de Polignac number, because 20852981 - 2² = 20852977 is a prime.

It is a super-2 number, since 2×20852981² = 869693633172722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20852921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10426490 + 10426491.

It is an arithmetic number, because the mean of its divisors is an integer number (10426491).

Almost surely, 2^20852981 is an apocalyptic number.

It is an amenable number.

20852981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20852981 is an equidigital number, since it uses as much as digits as its factorization.

20852981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 20852981 is about 4566.5064327120. The cubic root of 20852981 is about 275.2470771176.

The spelling of 20852981 in words is "twenty million, eight hundred fifty-two thousand, nine hundred eighty-one".