20201431 has 4 divisors (see below), whose sum is σ = 20532664. Its totient is φ = 19870200.

The previous prime is 20201407. The next prime is 20201437. The reversal of 20201431 is 13410202.

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 20201431 - 2⁷ = 20201303 is a prime.

It is a super-2 number, since 2×20201431² = 816195628895522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201437) 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, 165525 + ... + 165646.

It is an arithmetic number, because the mean of its divisors is an integer number (5133166).

Almost surely, 2^20201431 is an apocalyptic number.

20201431 is a deficient number, since it is larger than the sum of its proper divisors (331233).

20201431 is an equidigital number, since it uses as much as digits as its factorization.

20201431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331232.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20201431 is about 4494.6002046901. The cubic root of 20201431 is about 272.3499990883.

Adding to 20201431 its reverse (13410202), we get a palindrome (33611633).

The spelling of 20201431 in words is "twenty million, two hundred one thousand, four hundred thirty-one".