20436131 has 8 divisors (see below), whose sum is σ = 20883984. Its totient is φ = 19992960.

The previous prime is 20436113. The next prime is 20436133. The reversal of 20436131 is 13163402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20436131 is a prime.

It is a super-2 number, since 2×20436131² = 835270900498322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20436133) 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, 8495 + ... + 10631.

It is an arithmetic number, because the mean of its divisors is an integer number (2610498).

Almost surely, 2^20436131 is an apocalyptic number.

20436131 is a deficient number, since it is larger than the sum of its proper divisors (447853).

20436131 is a wasteful number, since it uses less digits than its factorization.

20436131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20436131 is about 4520.6339157247. The cubic root of 20436131 is about 273.4006604258.

Adding to 20436131 its reverse (13163402), we get a palindrome (33599533).

The spelling of 20436131 in words is "twenty million, four hundred thirty-six thousand, one hundred thirty-one".