20539494 has 40 divisors (see below), whose sum is σ = 48453240. Its totient is φ = 6485184.

The previous prime is 20539489. The next prime is 20539507. The reversal of 20539494 is 49493502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 259 + ... + 6414.

It is an arithmetic number, because the mean of its divisors is an integer number (1211331).

Almost surely, 2^20539494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20539494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24226620).

20539494 is an abundant number, since it is smaller than the sum of its proper divisors (27913746).

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

20539494 is a wasteful number, since it uses less digits than its factorization.

20539494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6706 (or 6697 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20539494 is about 4532.0518531897. The cubic root of 20539494 is about 273.8608258343.

The spelling of 20539494 in words is "twenty million, five hundred thirty-nine thousand, four hundred ninety-four".