20403834 has 64 divisors (see below), whose sum is σ = 47900160. Its totient is φ = 5728320.

The previous prime is 20403811. The next prime is 20403841. The reversal of 20403834 is 43830402.

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, 66309 + ... + 66615.

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

Almost surely, 2^20403834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20403834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23950080).

20403834 is an abundant number, since it is smaller than the sum of its proper divisors (27496326).

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

20403834 is a wasteful number, since it uses less digits than its factorization.

20403834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20403834 is about 4517.0603272482. The cubic root of 20403834 is about 273.2565581846.

The spelling of 20403834 in words is "twenty million, four hundred three thousand, eight hundred thirty-four".