20261131 has 8 divisors (see below), whose sum is σ = 22478400. Its totient is φ = 18106440.

The previous prime is 20261123. The next prime is 20261147. The reversal of 20261131 is 13116202.

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

It is not a de Polignac number, because 20261131 - 2³ = 20261123 is a prime.

It is a super-2 number, since 2×20261131² = 821026858798322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20261191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14961 + ... + 16258.

It is an arithmetic number, because the mean of its divisors is an integer number (2809800).

Almost surely, 2^20261131 is an apocalyptic number.

20261131 is a deficient number, since it is larger than the sum of its proper divisors (2217269).

20261131 is a wasteful number, since it uses less digits than its factorization.

20261131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31289.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20261131 is about 4501.2366078668. The cubic root of 20261131 is about 272.6180214296.

Adding to 20261131 its reverse (13116202), we get a palindrome (33377333).

Subtracting from 20261131 its reverse (13116202), we obtain a square (7144929 = 2673²).

The spelling of 20261131 in words is "twenty million, two hundred sixty-one thousand, one hundred thirty-one".