20138622 has 64 divisors (see below), whose sum is σ = 47900160. Its totient is φ = 5526144.

The previous prime is 20138609. The next prime is 20138633. The reversal of 20138622 is 22683102.

It is a junction number, because it is equal to n+sod(n) for n = 20138592 and 20138601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184704 + ... + 184812.

It is an arithmetic number, because the mean of its divisors is an integer number (748440).

Almost surely, 2^20138622 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20138622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23950080).

20138622 is an abundant number, since it is smaller than the sum of its proper divisors (27761538).

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

20138622 is a wasteful number, since it uses less digits than its factorization.

20138622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20138622 is about 4487.6076031667. The cubic root of 20138622 is about 272.0674483108.

The spelling of 20138622 in words is "twenty million, one hundred thirty-eight thousand, six hundred twenty-two".