1220020191 has 64 divisors (see below), whose sum is σ = 2083200000. Its totient is φ = 699373440.

The previous prime is 1220020189. The next prime is 1220020199. The reversal of 1220020191 is 1910200221.

It is not a de Polignac number, because 1220020191 - 2¹ = 1220020189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220020199) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 405310 + ... + 408308.

It is an arithmetic number, because the mean of its divisors is an integer number (32550000).

Almost surely, 2^1220020191 is an apocalyptic number.

1220020191 is a deficient number, since it is larger than the sum of its proper divisors (863179809).

1220020191 is a wasteful number, since it uses less digits than its factorization.

1220020191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101 (or 3095 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1220020191 is about 34928.7874252743. The cubic root of 1220020191 is about 1068.5356248387.

The spelling of 1220020191 in words is "one billion, two hundred twenty million, twenty thousand, one hundred ninety-one".