20188734 has 16 divisors (see below), whose sum is σ = 40931472. Its totient is φ = 6637248.

The previous prime is 20188723. The next prime is 20188739. The reversal of 20188734 is 43788102.

It is a junction number, because it is equal to n+sod(n) for n = 20188695 and 20188704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20188739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22609 + ... + 23484.

It is an arithmetic number, because the mean of its divisors is an integer number (2558217).

Almost surely, 2^20188734 is an apocalyptic number.

20188734 is an abundant number, since it is smaller than the sum of its proper divisors (20742738).

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

20188734 is a wasteful number, since it uses less digits than its factorization.

20188734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46171.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 20188734 is about 4493.1875099978. The cubic root of 20188734 is about 272.2929280047.

The spelling of 20188734 in words is "twenty million, one hundred eighty-eight thousand, seven hundred thirty-four".