1020358990 has 32 divisors (see below), whose sum is σ = 2155760064. Its totient is φ = 340381440.

The previous prime is 1020358901. The next prime is 1020359063. The reversal of 1020358990 is 998530201.

It is a super-2 number, since 2×1020358990² = 2082264936947640200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

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, 194391 + ... + 199570.

It is an arithmetic number, because the mean of its divisors is an integer number (67367502).

Almost surely, 2^1020358990 is an apocalyptic number.

1020358990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1020358990 is an abundant number, since it is smaller than the sum of its proper divisors (1135401074).

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

1020358990 is a wasteful number, since it uses less digits than its factorization.

1020358990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394012.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1020358990 is about 31943.0585573767. The cubic root of 1020358990 is about 1006.7407896582.

The spelling of 1020358990 in words is "one billion, twenty million, three hundred fifty-eight thousand, nine hundred ninety".