220432561 has 4 divisors (see below), whose sum is σ = 221785072. Its totient is φ = 219080052.

The previous prime is 220432543. The next prime is 220432571. The reversal of 220432561 is 165234022.

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 a cyclic number.

It is not a de Polignac number, because 220432561 - 2¹⁷ = 220301489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220432501) 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, 676011 + ... + 676336.

It is an arithmetic number, because the mean of its divisors is an integer number (55446268).

Almost surely, 2^220432561 is an apocalyptic number.

It is an amenable number.

220432561 is a deficient number, since it is larger than the sum of its proper divisors (1352511).

220432561 is a wasteful number, since it uses less digits than its factorization.

220432561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352510.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 220432561 is about 14846.9714420147. The cubic root of 220432561 is about 604.0764644872.

Adding to 220432561 its reverse (165234022), we get a palindrome (385666583).

The spelling of 220432561 in words is "two hundred twenty million, four hundred thirty-two thousand, five hundred sixty-one".