20231431 has 4 divisors (see below), whose sum is σ = 22070664. Its totient is φ = 18392200.

The previous prime is 20231429. The next prime is 20231461. The reversal of 20231431 is 13413202.

It is a happy number.

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 20231431 - 2¹ = 20231429 is a prime.

It is a super-2 number, since 2×20231431² = 818621600615522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20231401) 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, 919600 + ... + 919621.

It is an arithmetic number, because the mean of its divisors is an integer number (5517666).

Almost surely, 2^20231431 is an apocalyptic number.

20231431 is a deficient number, since it is larger than the sum of its proper divisors (1839233).

20231431 is a wasteful number, since it uses less digits than its factorization.

20231431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839232.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20231431 is about 4497.9363045735. The cubic root of 20231431 is about 272.4847495884.

Adding to 20231431 its reverse (13413202), we get a palindrome (33644633).

The spelling of 20231431 in words is "twenty million, two hundred thirty-one thousand, four hundred thirty-one".