20263638 has 16 divisors (see below), whose sum is σ = 40647600. Its totient is φ = 6734496.

The previous prime is 20263637. The next prime is 20263657. The reversal of 20263638 is 83636202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20263631) 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 7 ways as a sum of consecutive naturals, for example, 2745 + ... + 6932.

It is an arithmetic number, because the mean of its divisors is an integer number (2540475).

Almost surely, 2^20263638 is an apocalyptic number.

20263638 is an abundant number, since it is smaller than the sum of its proper divisors (20383962).

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

20263638 is a wasteful number, since it uses less digits than its factorization.

20263638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10031.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 20263638 is about 4501.5150782820. The cubic root of 20263638 is about 272.6292650467.

The spelling of 20263638 in words is "twenty million, two hundred sixty-three thousand, six hundred thirty-eight".