220431897 has 12 divisors (see below), whose sum is σ = 363887680. Its totient is φ = 125961048.

The previous prime is 220431881. The next prime is 220431919. The reversal of 220431897 is 798134022.

It is not a de Polignac number, because 220431897 - 2⁴ = 220431881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220431397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1749397 + ... + 1749522.

Almost surely, 2^220431897 is an apocalyptic number.

It is an amenable number.

220431897 is a deficient number, since it is larger than the sum of its proper divisors (143455783).

220431897 is a wasteful number, since it uses less digits than its factorization.

220431897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498932 (or 3498929 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 220431897 is about 14846.9490805350. The cubic root of 220431897 is about 604.0758579417.

The spelling of 220431897 in words is "two hundred twenty million, four hundred thirty-one thousand, eight hundred ninety-seven".