20811234 has 16 divisors (see below), whose sum is σ = 41722560. Its totient is φ = 6920400.

The previous prime is 20811233. The next prime is 20811239. The reversal of 20811234 is 43211802.

It is a self number, because there is not a number n which added to its sum of digits gives 20811234.

It is not an unprimeable number, because it can be changed into a prime (20811233) 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, 1317 + ... + 6584.

It is an arithmetic number, because the mean of its divisors is an integer number (2607660).

Almost surely, 2^20811234 is an apocalyptic number.

20811234 is an abundant number, since it is smaller than the sum of its proper divisors (20911326).

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

20811234 is a wasteful number, since it uses less digits than its factorization.

20811234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8345.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20811234 is about 4561.9331428683. The cubic root of 20811234 is about 275.0632757976.

The spelling of 20811234 in words is "twenty million, eight hundred eleven thousand, two hundred thirty-four".