220620644 has 12 divisors (see below), whose sum is σ = 389835264. Its totient is φ = 109239144.

The previous prime is 220620641. The next prime is 220620667. The reversal of 220620644 is 446026022.

220620644 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (220620641) 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, 267332 + ... + 268155.

It is an arithmetic number, because the mean of its divisors is an integer number (32486272).

Almost surely, 2^220620644 is an apocalyptic number.

It is an amenable number.

220620644 is a deficient number, since it is larger than the sum of its proper divisors (169214620).

220620644 is a wasteful number, since it uses less digits than its factorization.

220620644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535594 (or 535592 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 220620644 is about 14853.3041441963. The cubic root of 220620644 is about 604.2482240709.

Adding to 220620644 its reverse (446026022), we get a palindrome (666646666).

The spelling of 220620644 in words is "two hundred twenty million, six hundred twenty thousand, six hundred forty-four".