220401535 has 4 divisors (see below), whose sum is σ = 264481848. Its totient is φ = 176321224.

The previous prime is 220401523. The next prime is 220401569. The reversal of 220401535 is 535104022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220401535 - 2⁹ = 220401023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22040149 + ... + 22040158.

It is an arithmetic number, because the mean of its divisors is an integer number (66120462).

Almost surely, 2^220401535 is an apocalyptic number.

220401535 is a deficient number, since it is larger than the sum of its proper divisors (44080313).

220401535 is an equidigital number, since it uses as much as digits as its factorization.

220401535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44080312.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 220401535 is about 14845.9265456892. The cubic root of 220401535 is about 604.0481217964.

Adding to 220401535 its reverse (535104022), we get a palindrome (755505557).

The spelling of 220401535 in words is "two hundred twenty million, four hundred one thousand, five hundred thirty-five".