1990298020 has 12 divisors (see below), whose sum is σ = 4179625884. Its totient is φ = 796119200.

The previous prime is 1990297997. The next prime is 1990298033. The reversal of 1990298020 is 208920991.

It can be written as a sum of positive squares in 2 ways, for example, as 1562304676 + 427993344 = 39526^2 + 20688^2 .

It is a super-2 number, since 2×1990298020² = 7922572416831840800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49757431 + ... + 49757470.

It is an arithmetic number, because the mean of its divisors is an integer number (348302157).

Almost surely, 2^1990298020 is an apocalyptic number.

1990298020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990298020 is an abundant number, since it is smaller than the sum of its proper divisors (2189327864).

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

1990298020 is a wasteful number, since it uses less digits than its factorization.

1990298020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99514910 (or 99514908 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 1990298020 is about 44612.7562475129. The cubic root of 1990298020 is about 1257.8804585619.

The spelling of 1990298020 in words is "one billion, nine hundred ninety million, two hundred ninety-eight thousand, twenty".