20431355 has 8 divisors (see below), whose sum is σ = 28020192. Its totient is φ = 14010048.

The previous prime is 20431343. The next prime is 20431381. The reversal of 20431355 is 55313402.

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 20431355 - 2¹⁴ = 20414971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20431355.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291842 + ... + 291911.

It is an arithmetic number, because the mean of its divisors is an integer number (3502524).

Almost surely, 2^20431355 is an apocalyptic number.

20431355 is a deficient number, since it is larger than the sum of its proper divisors (7588837).

20431355 is an equidigital number, since it uses as much as digits as its factorization.

20431355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583765.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20431355 is about 4520.1056403584. The cubic root of 20431355 is about 273.3793605152.

Adding to 20431355 its reverse (55313402), we get a palindrome (75744757).

The spelling of 20431355 in words is "twenty million, four hundred thirty-one thousand, three hundred fifty-five".