20413131 has 4 divisors (see below), whose sum is σ = 27217512. Its totient is φ = 13608752.

The previous prime is 20413117. The next prime is 20413147. The reversal of 20413131 is 13131402.

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

It is a cyclic number.

It is not a de Polignac number, because 20413131 - 2¹³ = 20404939 is a prime.

It is a super-2 number, since 2×20413131² = 833391834446322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20413131.

It is not an unprimeable number, because it can be changed into a prime (20413231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3402186 + ... + 3402191.

It is an arithmetic number, because the mean of its divisors is an integer number (6804378).

Almost surely, 2^20413131 is an apocalyptic number.

20413131 is a deficient number, since it is larger than the sum of its proper divisors (6804381).

20413131 is an equidigital number, since it uses as much as digits as its factorization.

20413131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6804380.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20413131 is about 4518.0893085463. The cubic root of 20413131 is about 273.2980549684.

Adding to 20413131 its reverse (13131402), we get a palindrome (33544533).

The spelling of 20413131 in words is "twenty million, four hundred thirteen thousand, one hundred thirty-one".