20201957 has 4 divisors (see below), whose sum is σ = 20583180. Its totient is φ = 19820736.

The previous prime is 20201939. The next prime is 20201969. The reversal of 20201957 is 75910202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8375236 + 11826721 = 2894^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201957 - 2¹² = 20197861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190532 + ... + 190637.

It is an arithmetic number, because the mean of its divisors is an integer number (5145795).

Almost surely, 2^20201957 is an apocalyptic number.

It is an amenable number.

20201957 is a deficient number, since it is larger than the sum of its proper divisors (381223).

20201957 is an equidigital number, since it uses as much as digits as its factorization.

20201957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381222.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 20201957 is about 4494.6587189685. The cubic root of 20201957 is about 272.3523628624.

It can be divided in two parts, 2020195 and 7, that added together give a palindrome (2020202).

The spelling of 20201957 in words is "twenty million, two hundred one thousand, nine hundred fifty-seven".