1220420431 has 8 divisors (see below), whose sum is σ = 1260339200. Its totient is φ = 1180536120.

The previous prime is 1220420419. The next prime is 1220420437. The reversal of 1220420431 is 1340240221.

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 1220420431 - 2⁷ = 1220420303 is a prime.

It is a super-2 number, since 2×1220420431² = 2978852056804451522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220420399 and 1220420408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220420437) 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, 77050 + ... + 91528.

It is an arithmetic number, because the mean of its divisors is an integer number (157542400).

Almost surely, 2^1220420431 is an apocalyptic number.

1220420431 is a deficient number, since it is larger than the sum of its proper divisors (39918769).

1220420431 is a wasteful number, since it uses less digits than its factorization.

1220420431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17229.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1220420431 is about 34934.5163269795. The cubic root of 1220420431 is about 1068.6524600471.

Adding to 1220420431 its reverse (1340240221), we get a palindrome (2560660652).

The spelling of 1220420431 in words is "one billion, two hundred twenty million, four hundred twenty thousand, four hundred thirty-one".