220011993 has 6 divisors (see below), whose sum is σ = 317795114. Its totient is φ = 146674656.

The previous prime is 220011973. The next prime is 220012007. The reversal of 220011993 is 399110022.

It can be written as a sum of positive squares in only one way, i.e., 195776064 + 24235929 = 13992^2 + 4923^2 .

It is not a de Polignac number, because 220011993 - 2¹³ = 220003801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220011923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12222880 + ... + 12222897.

Almost surely, 2^220011993 is an apocalyptic number.

It is an amenable number.

220011993 is a deficient number, since it is larger than the sum of its proper divisors (97783121).

220011993 is a wasteful number, since it uses less digits than its factorization.

220011993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24445783 (or 24445780 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 220011993 is about 14832.8012526293. The cubic root of 220011993 is about 603.6920430973.

The spelling of 220011993 in words is "two hundred twenty million, eleven thousand, nine hundred ninety-three".