220420031 has 4 divisors (see below), whose sum is σ = 237375432. Its totient is φ = 203464632.

The previous prime is 220420003. The next prime is 220420043. The reversal of 220420031 is 130024022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220420031 - 2⁶ = 220419967 is a prime.

It is a super-2 number, since 2×220420031² = 97169980132081922, 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 = 220419988 and 220420015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220420001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8477681 + ... + 8477706.

It is an arithmetic number, because the mean of its divisors is an integer number (59343858).

Almost surely, 2^220420031 is an apocalyptic number.

220420031 is a deficient number, since it is larger than the sum of its proper divisors (16955401).

220420031 is a wasteful number, since it uses less digits than its factorization.

220420031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16955400.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 220420031 is about 14846.5494644379. The cubic root of 220420031 is about 604.0650184748.

Adding to 220420031 its reverse (130024022), we get a palindrome (350444053).

The spelling of 220420031 in words is "two hundred twenty million, four hundred twenty thousand, thirty-one".