20434656 has 96 divisors (see below), whose sum is σ = 60213888. Its totient is φ = 6013440.

The previous prime is 20434651. The next prime is 20434703. The reversal of 20434656 is 65643402.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38811 + ... + 39333.

It is an arithmetic number, because the mean of its divisors is an integer number (627228).

Almost surely, 2^20434656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20434656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30106944).

20434656 is an abundant number, since it is smaller than the sum of its proper divisors (39779232).

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

20434656 is a wasteful number, since it uses less digits than its factorization.

20434656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 20434656 is about 4520.4707719440. The cubic root of 20434656 is about 273.3940826041.

It can be divided in two parts, 204346 and 56, that added together give a palindrome (204402).

The spelling of 20434656 in words is "twenty million, four hundred thirty-four thousand, six hundred fifty-six".