20201965 has 12 divisors (see below), whose sum is σ = 28200636. Its totient is φ = 13852608.

The previous prime is 20201939. The next prime is 20201969. The reversal of 20201965 is 56910202.

It can be written as a sum of positive squares in 2 ways, for example, as 7606564 + 12595401 = 2758^2 + 3549^2 .

It is not a de Polignac number, because 20201965 - 2¹¹ = 20199917 is a prime.

It is a super-2 number, since 2×20201965² = 816238779722450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40984 + ... + 41473.

It is an arithmetic number, because the mean of its divisors is an integer number (2350053).

Almost surely, 2^20201965 is an apocalyptic number.

It is an amenable number.

20201965 is a deficient number, since it is larger than the sum of its proper divisors (7998671).

20201965 is an equidigital number, since it uses as much as digits as its factorization.

20201965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82476 (or 82469 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20201965 is about 4494.6596089137. The cubic root of 20201965 is about 272.3523988130.

The spelling of 20201965 in words is "twenty million, two hundred one thousand, nine hundred sixty-five".