220907749 has 4 divisors (see below), whose sum is σ = 221112064. Its totient is φ = 220703436.

The previous prime is 220907747. The next prime is 220907759. The reversal of 220907749 is 947709022.

220907749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220907749 - 2¹ = 220907747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220907747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100527 + ... + 102700.

It is an arithmetic number, because the mean of its divisors is an integer number (55278016).

Almost surely, 2^220907749 is an apocalyptic number.

It is an amenable number.

220907749 is a deficient number, since it is larger than the sum of its proper divisors (204315).

220907749 is a wasteful number, since it uses less digits than its factorization.

220907749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204314.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 220907749 is about 14862.9656865647. The cubic root of 220907749 is about 604.5102235581.

The spelling of 220907749 in words is "two hundred twenty million, nine hundred seven thousand, seven hundred forty-nine".