20445131 has 8 divisors (see below), whose sum is σ = 23403264. Its totient is φ = 17496360.

The previous prime is 20445109. The next prime is 20445143. The reversal of 20445131 is 13154402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20445131 is a prime.

It is a super-2 number, since 2×20445131² = 836006763214322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3236 + ... + 7166.

It is an arithmetic number, because the mean of its divisors is an integer number (2925408).

Almost surely, 2^20445131 is an apocalyptic number.

20445131 is a deficient number, since it is larger than the sum of its proper divisors (2958133).

20445131 is an equidigital number, since it uses as much as digits as its factorization.

20445131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20445131 is about 4521.6292417667. The cubic root of 20445131 is about 273.4407894309.

Adding to 20445131 its reverse (13154402), we get a palindrome (33599533).

The spelling of 20445131 in words is "twenty million, four hundred forty-five thousand, one hundred thirty-one".