90020505 has 32 divisors (see below), whose sum is σ = 150958080. Its totient is φ = 45721280.

The previous prime is 90020501. The next prime is 90020527. The reversal of 90020505 is 50502009.

It is not a de Polignac number, because 90020505 - 2² = 90020501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90020501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106876 + ... + 107714.

It is an arithmetic number, because the mean of its divisors is an integer number (4717440).

Almost surely, 2^90020505 is an apocalyptic number.

It is an amenable number.

90020505 is a deficient number, since it is larger than the sum of its proper divisors (60937575).

90020505 is a wasteful number, since it uses less digits than its factorization.

90020505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 90020505 is about 9487.9136273472. The cubic root of 90020505 is about 448.1745058507.

It can be divided in two parts, 90020 and 505, that added together give a triangular number (90525 = T₄₂₅).

The spelling of 90020505 in words is "ninety million, twenty thousand, five hundred five".