20475638 has 8 divisors (see below), whose sum is σ = 30734640. Its totient is φ = 10230760.

The previous prime is 20475613. The next prime is 20475641. The reversal of 20475638 is 83657402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20475598 and 20475607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1568 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (3841830).

Almost surely, 2^20475638 is an apocalyptic number.

20475638 is a deficient number, since it is larger than the sum of its proper divisors (10259002).

20475638 is a wasteful number, since it uses less digits than its factorization.

20475638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7062.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20475638 is about 4525.0014364639. The cubic root of 20475638 is about 273.5767258310.

The spelling of 20475638 in words is "twenty million, four hundred seventy-five thousand, six hundred thirty-eight".