90342020 has 24 divisors (see below), whose sum is σ = 190680000. Its totient is φ = 35953632.

The previous prime is 90342013. The next prime is 90342023. The reversal of 90342020 is 2024309.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 90341983 and 90342001.

It is not an unprimeable number, because it can be changed into a prime (90342023) 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, 7370 + ... + 15329.

It is an arithmetic number, because the mean of its divisors is an integer number (7945000).

Almost surely, 2^90342020 is an apocalyptic number.

It is an amenable number.

90342020 is an abundant number, since it is smaller than the sum of its proper divisors (100337980).

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

90342020 is a wasteful number, since it uses less digits than its factorization.

90342020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22907 (or 22905 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 90342020 is about 9504.8419239880. The cubic root of 90342020 is about 448.7074348663.

Adding to 90342020 its reverse (2024309), we get a palindrome (92366329).

The spelling of 90342020 in words is "ninety million, three hundred forty-two thousand, twenty".