20653490 has 72 divisors (see below), whose sum is σ = 44686404. Its totient is φ = 6864000.

The previous prime is 20653489. The next prime is 20653499. The reversal of 20653490 is 9435602.

It can be written as a sum of positive squares in 6 ways, for example, as 6911641 + 13741849 = 2629^2 + 3707^2 .

It is not an unprimeable number, because it can be changed into a prime (20653499) 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 35 ways as a sum of consecutive naturals, for example, 204440 + ... + 204540.

Almost surely, 2^20653490 is an apocalyptic number.

20653490 is an abundant number, since it is smaller than the sum of its proper divisors (24032914).

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

20653490 is a wasteful number, since it uses less digits than its factorization.

20653490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20653490 is about 4544.6110944722. The cubic root of 20653490 is about 274.3665419601.

It can be divided in two parts, 2065 and 3490, that added together give a palindrome (5555).

The spelling of 20653490 in words is "twenty million, six hundred fifty-three thousand, four hundred ninety".