20908134 has 48 divisors (see below), whose sum is σ = 49140000. Its totient is φ = 6386688.

The previous prime is 20908133. The next prime is 20908141. The reversal of 20908134 is 43180902.

It is a junction number, because it is equal to n+sod(n) for n = 20908098 and 20908107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20908133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46342 + ... + 46790.

It is an arithmetic number, because the mean of its divisors is an integer number (1023750).

Almost surely, 2^20908134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20908134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24570000).

20908134 is an abundant number, since it is smaller than the sum of its proper divisors (28231866).

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

20908134 is a wasteful number, since it uses less digits than its factorization.

20908134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20908134 is about 4572.5413065384. The cubic root of 20908134 is about 275.4895258770.

The spelling of 20908134 in words is "twenty million, nine hundred eight thousand, one hundred thirty-four".