20845090 has 48 divisors (see below), whose sum is σ = 45964800. Its totient is φ = 6767712.

The previous prime is 20845073. The next prime is 20845091. The reversal of 20845090 is 9054802.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20845091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8191 + ... + 10429.

It is an arithmetic number, because the mean of its divisors is an integer number (957600).

Almost surely, 2^20845090 is an apocalyptic number.

20845090 is an abundant number, since it is smaller than the sum of its proper divisors (25119710).

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

20845090 is a wasteful number, since it uses less digits than its factorization.

20845090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279 (or 2272 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20845090 is about 4565.6423425406. The cubic root of 20845090 is about 275.2123538853.

Adding to 20845090 its reverse (9054802), we get a palindrome (29899892).

The spelling of 20845090 in words is "twenty million, eight hundred forty-five thousand, ninety".