220403993 has 2 divisors, whose sum is σ = 220403994. Its totient is φ = 220403992.

The previous prime is 220403983. The next prime is 220404007. The reversal of 220403993 is 399304022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165688384 + 54715609 = 12872^2 + 7397^2 .

It is a cyclic number.

It is not a de Polignac number, because 220403993 - 2⁴ = 220403977 is a prime.

It is equal to p_12143489 and since 220403993 and 12143489 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (220403923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110201996 + 110201997.

It is an arithmetic number, because the mean of its divisors is an integer number (110201997).

Almost surely, 2^220403993 is an apocalyptic number.

It is an amenable number.

220403993 is a deficient number, since it is larger than the sum of its proper divisors (1).

220403993 is an equidigital number, since it uses as much as digits as its factorization.

220403993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 220403993 is about 14846.0093291093. The cubic root of 220403993 is about 604.0503673113.

The spelling of 220403993 in words is "two hundred twenty million, four hundred three thousand, nine hundred ninety-three".