220905638 has 4 divisors (see below), whose sum is σ = 331358460. Its totient is φ = 110452818.

The previous prime is 220905589. The next prime is 220905653. The reversal of 220905638 is 836509022.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220905598 and 220905607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55226408 + ... + 55226411.

It is an arithmetic number, because the mean of its divisors is an integer number (82839615).

Almost surely, 2^220905638 is an apocalyptic number.

220905638 is a deficient number, since it is larger than the sum of its proper divisors (110452822).

220905638 is a wasteful number, since it uses less digits than its factorization.

220905638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110452821.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 220905638 is about 14862.8946709583. The cubic root of 220905638 is about 604.5082979803.

The spelling of 220905638 in words is "two hundred twenty million, nine hundred five thousand, six hundred thirty-eight".