220520745 has 64 divisors (see below), whose sum is σ = 416160000. Its totient is φ = 110481408.

The previous prime is 220520737. The next prime is 220520749. The reversal of 220520745 is 547025022.

It is not a de Polignac number, because 220520745 - 2³ = 220520737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (220520749) 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, 381897 + ... + 382473.

It is an arithmetic number, because the mean of its divisors is an integer number (6502500).

Almost surely, 2^220520745 is an apocalyptic number.

It is an amenable number.

220520745 is a deficient number, since it is larger than the sum of its proper divisors (195639255).

220520745 is a wasteful number, since it uses less digits than its factorization.

220520745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 220520745 is about 14849.9409089733. The cubic root of 220520745 is about 604.1570073023.

Adding to 220520745 its reverse (547025022), we get a palindrome (767545767).

The spelling of 220520745 in words is "two hundred twenty million, five hundred twenty thousand, seven hundred forty-five".