220001994 has 28 divisors (see below), whose sum is σ = 494781426. Its totient is φ = 73333512.

The previous prime is 220001953. The next prime is 220002031. The reversal of 220001994 is 499100022.

It can be written as a sum of positive squares in only one way, i.e., 216531225 + 3470769 = 14715^2 + 1863^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 73989 + ... + 76904.

Almost surely, 2^220001994 is an apocalyptic number.

220001994 is an abundant number, since it is smaller than the sum of its proper divisors (274779432).

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

220001994 is an equidigital number, since it uses as much as digits as its factorization.

220001994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150913 (or 150898 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 220001994 is about 14832.4641917653. The cubic root of 220001994 is about 603.6828975228.

The spelling of 220001994 in words is "two hundred twenty million, one thousand, nine hundred ninety-four".