20312001 has 24 divisors (see below), whose sum is σ = 30388904. Its totient is φ = 13063680.

The previous prime is 20311981. The next prime is 20312021. The reversal of 20312001 is 10021302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20311981) and next prime (20312021).

It can be written as a sum of positive squares in 4 ways, for example, as 518400 + 19793601 = 720^2 + 4449^2 .

It is not a de Polignac number, because 20312001 - 2⁶ = 20311937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60105 + ... + 60441.

Almost surely, 2^20312001 is an apocalyptic number.

It is an amenable number.

20312001 is a deficient number, since it is larger than the sum of its proper divisors (10076903).

20312001 is a wasteful number, since it uses less digits than its factorization.

20312001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20312001 is about 4506.8837349104. The cubic root of 20312001 is about 272.8459864699.

Adding to 20312001 its reverse (10021302), we get a palindrome (30333303).

The spelling of 20312001 in words is "twenty million, three hundred twelve thousand, one".