220506407 has 6 divisors (see below), whose sum is σ = 242374944. Its totient is φ = 200460260.

The previous prime is 220506397. The next prime is 220506409. The reversal of 220506407 is 704605022.

It is a de Polignac number, because none of the positive numbers 2^k-220506407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220506409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 911063 + ... + 911304.

It is an arithmetic number, because the mean of its divisors is an integer number (40395824).

Almost surely, 2^220506407 is an apocalyptic number.

220506407 is a deficient number, since it is larger than the sum of its proper divisors (21868537).

220506407 is a wasteful number, since it uses less digits than its factorization.

220506407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822389 (or 1822378 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 220506407 is about 14849.4581382622. The cubic root of 220506407 is about 604.1439131587.

The spelling of 220506407 in words is "two hundred twenty million, five hundred six thousand, four hundred seven".