220399431 has 16 divisors (see below), whose sum is σ = 336094464. Its totient is φ = 125849664.

The previous prime is 220399393. The next prime is 220399451. The reversal of 220399431 is 134993022.

It is not a de Polignac number, because 220399431 - 2⁷ = 220399303 is a prime.

It is a super-2 number, since 2×220399431² = 97151818370247522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 220399392 and 220399401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220399451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33820 + ... + 39806.

It is an arithmetic number, because the mean of its divisors is an integer number (21005904).

Almost surely, 2^220399431 is an apocalyptic number.

220399431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

220399431 is a deficient number, since it is larger than the sum of its proper divisors (115695033).

220399431 is a wasteful number, since it uses less digits than its factorization.

220399431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7750.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 220399431 is about 14845.8556843316. The cubic root of 220399431 is about 604.0461996663.

The spelling of 220399431 in words is "two hundred twenty million, three hundred ninety-nine thousand, four hundred thirty-one".