20608638 has 8 divisors (see below), whose sum is σ = 41217288. Its totient is φ = 6869544.

The previous prime is 20608613. The next prime is 20608657. The reversal of 20608638 is 83680602.

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

20608638 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20608599 and 20608608.

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, 1717381 + ... + 1717392.

It is an arithmetic number, because the mean of its divisors is an integer number (5152161).

Almost surely, 2^20608638 is an apocalyptic number.

20608638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20608638 is a wasteful number, since it uses less digits than its factorization.

20608638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3434778.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20608638 is about 4539.6737768258. The cubic root of 20608638 is about 274.1677893215.

The spelling of 20608638 in words is "twenty million, six hundred eight thousand, six hundred thirty-eight".