20354431 has 4 divisors (see below), whose sum is σ = 20787552. Its totient is φ = 19921312.

The previous prime is 20354413. The next prime is 20354441. The reversal of 20354431 is 13445302.

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 20354431 - 2⁷ = 20354303 is a prime.

It is a super-2 number, since 2×20354431² = 828605722667522, 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 (20354441) 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, 216490 + ... + 216583.

It is an arithmetic number, because the mean of its divisors is an integer number (5196888).

Almost surely, 2^20354431 is an apocalyptic number.

20354431 is a deficient number, since it is larger than the sum of its proper divisors (433121).

20354431 is an equidigital number, since it uses as much as digits as its factorization.

20354431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433120.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20354431 is about 4511.5885229041. The cubic root of 20354431 is about 273.0358381661.

Adding to 20354431 its reverse (13445302), we get a palindrome (33799733).

The spelling of 20354431 in words is "twenty million, three hundred fifty-four thousand, four hundred thirty-one".