220505720 has 32 divisors (see below), whose sum is σ = 507679920. Its totient is φ = 86150400.

The previous prime is 220505713. The next prime is 220505729. The reversal of 220505720 is 27505022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220505729) 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 7 ways as a sum of consecutive naturals, for example, 62381 + ... + 65820.

Almost surely, 2^220505720 is an apocalyptic number.

220505720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220505720 is an abundant number, since it is smaller than the sum of its proper divisors (287174200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220505720 is a wasteful number, since it uses less digits than its factorization.

220505720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128255 (or 128251 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 220505720 is about 14849.4350060869. The cubic root of 220505720 is about 604.1432857434.

The spelling of 220505720 in words is "two hundred twenty million, five hundred five thousand, seven hundred twenty".