1990100220 has 24 divisors (see below), whose sum is σ = 5572280784. Its totient is φ = 530693376.

The previous prime is 1990100219. The next prime is 1990100221. The reversal of 1990100220 is 220010991.

It is an interprime number because it is at equal distance from previous prime (1990100219) and next prime (1990100221).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990100221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16584109 + ... + 16584228.

It is an arithmetic number, because the mean of its divisors is an integer number (232178366).

Almost surely, 2^1990100220 is an apocalyptic number.

1990100220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990100220 is an abundant number, since it is smaller than the sum of its proper divisors (3582180564).

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

1990100220 is a wasteful number, since it uses less digits than its factorization.

1990100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33168349 (or 33168347 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1990100220 is about 44610.5393376946. The cubic root of 1990100220 is about 1257.8387869136.

The spelling of 1990100220 in words is "one billion, nine hundred ninety million, one hundred thousand, two hundred twenty".