220504681 has 2 divisors, whose sum is σ = 220504682. Its totient is φ = 220504680.

The previous prime is 220504673. The next prime is 220504693. The reversal of 220504681 is 186405022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141134400 + 79370281 = 11880^2 + 8909^2 .

It is a cyclic number.

It is not a de Polignac number, because 220504681 - 2³ = 220504673 is a prime.

It is a super-2 number, since 2×220504681² = 97244628685823522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (220504631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110252340 + 110252341.

It is an arithmetic number, because the mean of its divisors is an integer number (110252341).

Almost surely, 2^220504681 is an apocalyptic number.

It is an amenable number.

220504681 is a deficient number, since it is larger than the sum of its proper divisors (1).

220504681 is an equidigital number, since it uses as much as digits as its factorization.

220504681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 220504681 is about 14849.4000215497. The cubic root of 220504681 is about 604.1423368551.

The spelling of 220504681 in words is "two hundred twenty million, five hundred four thousand, six hundred eighty-one".