1990747220 has 48 divisors (see below), whose sum is σ = 5212142208. Its totient is φ = 620492160.

The previous prime is 1990747189. The next prime is 1990747237. The reversal of 1990747220 is 227470991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 644807 + ... + 647886.

It is an arithmetic number, because the mean of its divisors is an integer number (108586296).

Almost surely, 2^1990747220 is an apocalyptic number.

1990747220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990747220 is an abundant number, since it is smaller than the sum of its proper divisors (3221394988).

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

1990747220 is a wasteful number, since it uses less digits than its factorization.

1990747220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292720 (or 1292718 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 1990747220 is about 44617.7903980016. The cubic root of 1990747220 is about 1257.9750838212.

The spelling of 1990747220 in words is "one billion, nine hundred ninety million, seven hundred forty-seven thousand, two hundred twenty".