20454590 has 32 divisors (see below), whose sum is σ = 41380416. Its totient is φ = 7223040.

The previous prime is 20454589. The next prime is 20454593. The reversal of 20454590 is 9545402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20454593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431 + ... + 6410.

It is an arithmetic number, because the mean of its divisors is an integer number (1293138).

Almost surely, 2^20454590 is an apocalyptic number.

20454590 is an abundant number, since it is smaller than the sum of its proper divisors (20925826).

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

20454590 is a wasteful number, since it uses less digits than its factorization.

20454590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6884.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20454590 is about 4522.6750933491. The cubic root of 20454590 is about 273.4829523245.

Adding to 20454590 its reverse (9545402), we get a palindrome (29999992).

The spelling of 20454590 in words is "twenty million, four hundred fifty-four thousand, five hundred ninety".