20923638 has 8 divisors (see below), whose sum is σ = 41847288. Its totient is φ = 6974544.

The previous prime is 20923621. The next prime is 20923649. The reversal of 20923638 is 83632902.

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

20923638 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20923599 and 20923608.

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, 1743631 + ... + 1743642.

It is an arithmetic number, because the mean of its divisors is an integer number (5230911).

Almost surely, 2^20923638 is an apocalyptic number.

20923638 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.

20923638 is a wasteful number, since it uses less digits than its factorization.

20923638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3487278.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 20923638 is about 4574.2363297058. The cubic root of 20923638 is about 275.5576035974.

The spelling of 20923638 in words is "twenty million, nine hundred twenty-three thousand, six hundred thirty-eight".