220731804 has 30 divisors (see below), whose sum is σ = 577037384. Its totient is φ = 73577160.

The previous prime is 220731773. The next prime is 220731821. The reversal of 220731804 is 408137022.

It is a super-4 number, since 4×220731804⁴ (a number of 34 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 340312 + ... + 340959.

Almost surely, 2^220731804 is an apocalyptic number.

It is an amenable number.

220731804 is an abundant number, since it is smaller than the sum of its proper divisors (356305580).

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

220731804 is a wasteful number, since it uses less digits than its factorization.

220731804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681287 (or 681276 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 220731804 is about 14857.0456013300. The cubic root of 220731804 is about 604.3496907841.

Adding to 220731804 its reverse (408137022), we get a palindrome (628868826).

The spelling of 220731804 in words is "two hundred twenty million, seven hundred thirty-one thousand, eight hundred four".