1900020680 has 32 divisors (see below), whose sum is σ = 4345134840. Its totient is φ = 747548160.

The previous prime is 1900020679. The next prime is 1900020701. The reversal of 1900020680 is 860200091.

It can be written as a sum of positive squares in 4 ways, for example, as 510669604 + 1389351076 = 22598^2 + 37274^2 .

It is a super-2 number, since 2×1900020680² = 7220157168855324800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386909 + ... + 391788.

Almost surely, 2^1900020680 is an apocalyptic number.

1900020680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1900020680 is an abundant number, since it is smaller than the sum of its proper divisors (2445114160).

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

1900020680 is a wasteful number, since it uses less digits than its factorization.

1900020680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778769 (or 778765 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1900020680 is about 43589.2266506301. The cubic root of 1900020680 is about 1238.5668232049.

The spelling of 1900020680 in words is "one billion, nine hundred million, twenty thousand, six hundred eighty".