220031993 has 2 divisors, whose sum is σ = 220031994. Its totient is φ = 220031992.

The previous prime is 220031971. The next prime is 220032011. The reversal of 220031993 is 399130022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219869584 + 162409 = 14828^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 220031993 - 2¹² = 220027897 is a prime.

It is not a weakly prime, because it can be changed into another prime (220031963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110015996 + 110015997.

It is an arithmetic number, because the mean of its divisors is an integer number (110015997).

Almost surely, 2^220031993 is an apocalyptic number.

It is an amenable number.

220031993 is a deficient number, since it is larger than the sum of its proper divisors (1).

220031993 is an equidigital number, since it uses as much as digits as its factorization.

220031993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 220031993 is about 14833.4754187952. The cubic root of 220031993 is about 603.7103352441.

The spelling of 220031993 in words is "two hundred twenty million, thirty-one thousand, nine hundred ninety-three".