220401504 has 36 divisors (see below), whose sum is σ = 626767596. Its totient is φ = 73467072.

The previous prime is 220401497. The next prime is 220401509. The reversal of 220401504 is 405104022.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220401509) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 382354 + ... + 382929.

It is an arithmetic number, because the mean of its divisors is an integer number (17410211).

Almost surely, 2^220401504 is an apocalyptic number.

220401504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

220401504 is an abundant number, since it is smaller than the sum of its proper divisors (406366092).

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

220401504 is a wasteful number, since it uses less digits than its factorization.

220401504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765299 (or 765288 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 220401504 is about 14845.9255016318. The cubic root of 220401504 is about 604.0480934761.

Adding to 220401504 its reverse (405104022), we get a palindrome (625505526).

The spelling of 220401504 in words is "two hundred twenty million, four hundred one thousand, five hundred four".