90023820 has 24 divisors (see below), whose sum is σ = 252066864. Its totient is φ = 24006336.

The previous prime is 90023803. The next prime is 90023851. The reversal of 90023820 is 2832009.

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, 750139 + ... + 750258.

It is an arithmetic number, because the mean of its divisors is an integer number (10502786).

Almost surely, 2^90023820 is an apocalyptic number.

It is an amenable number.

90023820 is an abundant number, since it is smaller than the sum of its proper divisors (162043044).

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

90023820 is a wasteful number, since it uses less digits than its factorization.

90023820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500409 (or 1500407 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 90023820 is about 9488.0883216800. The cubic root of 90023820 is about 448.1800071168.

Adding to 90023820 its reverse (2832009), we get a palindrome (92855829).

The spelling of 90023820 in words is "ninety million, twenty-three thousand, eight hundred twenty".