220949647 has 6 divisors (see below), whose sum is σ = 222858368. Its totient is φ = 219043692.

The previous prime is 220949591. The next prime is 220949653. The reversal of 220949647 is 746949022.

It is a de Polignac number, because none of the positive numbers 2^k-220949647 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 (220949147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166854 + ... + 168172.

Almost surely, 2^220949647 is an apocalyptic number.

220949647 is a deficient number, since it is larger than the sum of its proper divisors (1908721).

220949647 is an frugal number, since it uses more digits than its factorization.

220949647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765 (or 1446 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 220949647 is about 14864.3750961821. The cubic root of 220949647 is about 604.5484388589.

The spelling of 220949647 in words is "two hundred twenty million, nine hundred forty-nine thousand, six hundred forty-seven".