220666840 has 32 divisors (see below), whose sum is σ = 497605680. Its totient is φ = 88070272.

The previous prime is 220666837. The next prime is 220666843. The reversal of 220666840 is 48666022.

It is an interprime number because it is at equal distance from previous prime (220666837) and next prime (220666843).

It is a junction number, because it is equal to n+sod(n) for n = 220666796 and 220666805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220666843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12774 + ... + 24586.

Almost surely, 2^220666840 is an apocalyptic number.

220666840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220666840 is an abundant number, since it is smaller than the sum of its proper divisors (276938840).

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

220666840 is a wasteful number, since it uses less digits than its factorization.

220666840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12291 (or 12287 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 220666840 is about 14854.8591376694. The cubic root of 220666840 is about 604.2903958617.

The spelling of 220666840 in words is "two hundred twenty million, six hundred sixty-six thousand, eight hundred forty".