20013331 has 16 divisors (see below), whose sum is σ = 22226400. Its totient is φ = 17906688.

The previous prime is 20013319. The next prime is 20013347. The reversal of 20013331 is 13331002.

It is a cyclic number.

It is not a de Polignac number, because 20013331 - 2⁵ = 20013299 is a prime.

It is a super-2 number, since 2×20013331² = 801066835431122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74265 + ... + 74533.

It is an arithmetic number, because the mean of its divisors is an integer number (1389150).

Almost surely, 2^20013331 is an apocalyptic number.

20013331 is a deficient number, since it is larger than the sum of its proper divisors (2213069).

20013331 is a wasteful number, since it uses less digits than its factorization.

20013331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 20013331 is about 4473.6261578277. The cubic root of 20013331 is about 271.5020581000.

Adding to 20013331 its reverse (13331002), we get a palindrome (33344333).

It can be divided in two parts, 200 and 13331, that added together give a palindrome (13531).

The spelling of 20013331 in words is "twenty million, thirteen thousand, three hundred thirty-one".