220739997 has 4 divisors (see below), whose sum is σ = 294320000. Its totient is φ = 147159996.

The previous prime is 220739969. The next prime is 220739999. The reversal of 220739997 is 799937022.

220739997 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 not a de Polignac number, because 220739997 - 2¹⁸ = 220477853 is a prime.

It is a super-2 number, since 2×220739997² = 97452292551120018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220739999) 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, 36789997 + ... + 36790002.

It is an arithmetic number, because the mean of its divisors is an integer number (73580000).

Almost surely, 2^220739997 is an apocalyptic number.

It is an amenable number.

220739997 is a deficient number, since it is larger than the sum of its proper divisors (73580003).

220739997 is an equidigital number, since it uses as much as digits as its factorization.

220739997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73580002.

The product of its (nonzero) digits is 428652, while the sum is 48.

The square root of 220739997 is about 14857.3213265380. The cubic root of 220739997 is about 604.3571679965.

The spelling of 220739997 in words is "two hundred twenty million, seven hundred thirty-nine thousand, nine hundred ninety-seven".