20331901 has 2 divisors, whose sum is σ = 20331902. Its totient is φ = 20331900.

The previous prime is 20331893. The next prime is 20331917. The reversal of 20331901 is 10913302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20259001 + 72900 = 4501^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331901 - 2³ = 20331893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165950 + 10165951.

It is an arithmetic number, because the mean of its divisors is an integer number (10165951).

Almost surely, 2^20331901 is an apocalyptic number.

It is an amenable number.

20331901 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331901 is an equidigital number, since it uses as much as digits as its factorization.

20331901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 20331901 is about 4509.0909283358. The cubic root of 20331901 is about 272.9350612805.

The spelling of 20331901 in words is "twenty million, three hundred thirty-one thousand, nine hundred one".