1220020188 has 48 divisors (see below), whose sum is σ = 3003920640. Its totient is φ = 384613504.

The previous prime is 1220020163. The next prime is 1220020189. The reversal of 1220020188 is 8810200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220020189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270 + ... + 49397.

It is an arithmetic number, because the mean of its divisors is an integer number (62581680).

Almost surely, 2^1220020188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220020188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1501960320).

1220020188 is an abundant number, since it is smaller than the sum of its proper divisors (1783900452).

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

1220020188 is a wasteful number, since it uses less digits than its factorization.

1220020188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49786 (or 49784 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 1220020188 is about 34928.7873823298. The cubic root of 1220020188 is about 1068.5356239629.

The spelling of 1220020188 in words is "one billion, two hundred twenty million, twenty thousand, one hundred eighty-eight".