220638775 has 24 divisors (see below), whose sum is σ = 313417440. Its totient is φ = 150936960.

The previous prime is 220638739. The next prime is 220638787. The reversal of 220638775 is 577836022.

It is not a de Polignac number, because 220638775 - 2¹⁵ = 220606007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87837 + ... + 90313.

It is an arithmetic number, because the mean of its divisors is an integer number (13059060).

Almost surely, 2^220638775 is an apocalyptic number.

220638775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

220638775 is a deficient number, since it is larger than the sum of its proper divisors (92778665).

220638775 is a wasteful number, since it uses less digits than its factorization.

220638775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003 (or 2998 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 220638775 is about 14853.9144672372. The cubic root of 220638775 is about 604.2647763516.

The spelling of 220638775 in words is "two hundred twenty million, six hundred thirty-eight thousand, seven hundred seventy-five".