220641645 has 64 divisors (see below), whose sum is σ = 423972864. Its totient is φ = 95800320.

The previous prime is 220641637. The next prime is 220641649. The reversal of 220641645 is 546146022.

It is not a de Polignac number, because 220641645 - 2³ = 220641637 is a prime.

It is a super-3 number, since 3×220641645³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220641649) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 509349 + ... + 509781.

It is an arithmetic number, because the mean of its divisors is an integer number (6624576).

Almost surely, 2^220641645 is an apocalyptic number.

It is an amenable number.

220641645 is a deficient number, since it is larger than the sum of its proper divisors (203331219).

220641645 is a wasteful number, since it uses less digits than its factorization.

220641645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 220641645 is about 14854.0110744539. The cubic root of 220641645 is about 604.2673963691.

Adding to 220641645 its reverse (546146022), we get a palindrome (766787667).

The spelling of 220641645 in words is "two hundred twenty million, six hundred forty-one thousand, six hundred forty-five".