220400004 has 24 divisors (see below), whose sum is σ = 561018528. Its totient is φ = 66787840.

The previous prime is 220400003. The next prime is 220400021. The reversal of 220400004 is 400004022.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (220400003) 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, 834717 + ... + 834980.

It is an arithmetic number, because the mean of its divisors is an integer number (23375772).

Almost surely, 2^220400004 is an apocalyptic number.

It is an amenable number.

220400004 is an abundant number, since it is smaller than the sum of its proper divisors (340618524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220400004 is a wasteful number, since it uses less digits than its factorization.

220400004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669715 (or 1669713 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 220400004 is about 14845.8749826341. The cubic root of 220400004 is about 604.0467231373.

Adding to 220400004 its reverse (400004022), we get a palindrome (620404026).

The spelling of 220400004 in words is "two hundred twenty million, four hundred thousand, four".