20214431 has 4 divisors (see below), whose sum is σ = 20223672. Its totient is φ = 20205192.

The previous prime is 20214427. The next prime is 20214437. The reversal of 20214431 is 13441202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13441202 = 2 ⋅6720601.

It is a cyclic number.

It is not a de Polignac number, because 20214431 - 2² = 20214427 is a prime.

It is a super-2 number, since 2×20214431² = 817246441307522, 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 (20214437) 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, 716 + ... + 6398.

It is an arithmetic number, because the mean of its divisors is an integer number (5055918).

Almost surely, 2^20214431 is an apocalyptic number.

20214431 is a deficient number, since it is larger than the sum of its proper divisors (9241).

20214431 is an equidigital number, since it uses as much as digits as its factorization.

20214431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9240.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20214431 is about 4496.0461518984. The cubic root of 20214431 is about 272.4084073398.

Adding to 20214431 its reverse (13441202), we get a palindrome (33655633).

The spelling of 20214431 in words is "twenty million, two hundred fourteen thousand, four hundred thirty-one".