20919834 has 72 divisors (see below), whose sum is σ = 51329460. Its totient is φ = 6157008.

The previous prime is 20919797. The next prime is 20919859. The reversal of 20919834 is 43891902.

It can be written as a sum of positive squares in 2 ways, for example, as 6517809 + 14402025 = 2553^2 + 3795^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 909547 + ... + 909569.

Almost surely, 2^20919834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20919834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25664730).

20919834 is an abundant number, since it is smaller than the sum of its proper divisors (30409626).

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

20919834 is a wasteful number, since it uses less digits than its factorization.

20919834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20919834 is about 4573.8205036927. The cubic root of 20919834 is about 275.5409034319.

The spelling of 20919834 in words is "twenty million, nine hundred nineteen thousand, eight hundred thirty-four".