20280431 has 8 divisors (see below), whose sum is σ = 20779440. Its totient is φ = 19787328.

The previous prime is 20280419. The next prime is 20280433. The reversal of 20280431 is 13408202.

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

It is a cyclic number.

It is not a de Polignac number, because 20280431 - 2¹⁴ = 20264047 is a prime.

It is a super-2 number, since 2×20280431² = 822591763091522, 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 (20280433) 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, 5915 + ... + 8691.

It is an arithmetic number, because the mean of its divisors is an integer number (2597430).

Almost surely, 2^20280431 is an apocalyptic number.

20280431 is a deficient number, since it is larger than the sum of its proper divisors (499009).

20280431 is a wasteful number, since it uses less digits than its factorization.

20280431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20280431 is about 4503.3799528798. The cubic root of 20280431 is about 272.7045558890.

Adding to 20280431 its reverse (13408202), we get a palindrome (33688633).

The spelling of 20280431 in words is "twenty million, two hundred eighty thousand, four hundred thirty-one".