20260638 has 32 divisors (see below), whose sum is σ = 45177120. Its totient is φ = 6730560.

The previous prime is 20260637. The next prime is 20260649. The reversal of 20260638 is 83606202.

20260638 is a `hidden beast` number, since 2 + 0 + 26 + 0 + 638 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20260637) 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, 24268 + ... + 25088.

It is an arithmetic number, because the mean of its divisors is an integer number (1411785).

Almost surely, 2^20260638 is an apocalyptic number.

20260638 is an abundant number, since it is smaller than the sum of its proper divisors (24916482).

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

20260638 is a wasteful number, since it uses less digits than its factorization.

20260638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289 (or 1283 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20260638 is about 4501.1818448048. The cubic root of 20260638 is about 272.6158102702.

The spelling of 20260638 in words is "twenty million, two hundred sixty thousand, six hundred thirty-eight".