1085990020 has 24 divisors (see below), whose sum is σ = 2281204800. Its totient is φ = 434276832.

The previous prime is 1085989991. The next prime is 1085990021. The reversal of 1085990020 is 200995801.

It is not an unprimeable number, because it can be changed into a prime (1085990021) 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, 122911 + ... + 131449.

It is an arithmetic number, because the mean of its divisors is an integer number (95050200).

Almost surely, 2^1085990020 is an apocalyptic number.

1085990020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1085990020 is an abundant number, since it is smaller than the sum of its proper divisors (1195214780).

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

1085990020 is a wasteful number, since it uses less digits than its factorization.

1085990020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14907 (or 14905 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1085990020 is about 32954.3626853866. The cubic root of 1085990020 is about 1027.8788849828.

The spelling of 1085990020 in words is "one billion, eighty-five million, nine hundred ninety thousand, twenty".