20634012 has 72 divisors (see below), whose sum is σ = 61248096. Its totient is φ = 5733504.

The previous prime is 20634001. The next prime is 20634017. The reversal of 20634012 is 21043602.

It is a happy number.

20634012 is a `hidden beast` number, since 20 + 634 + 0 + 12 = 666.

It is a super-2 number, since 2×20634012² = 851524902432288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20634017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8218 + ... + 10430.

It is an arithmetic number, because the mean of its divisors is an integer number (850668).

Almost surely, 2^20634012 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 20634012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30624048).

20634012 is an abundant number, since it is smaller than the sum of its proper divisors (40614084).

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

20634012 is a wasteful number, since it uses less digits than its factorization.

20634012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267 (or 2262 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20634012 is about 4542.4676113320. The cubic root of 20634012 is about 274.2802644937.

Adding to 20634012 its reverse (21043602), we get a palindrome (41677614).

The spelling of 20634012 in words is "twenty million, six hundred thirty-four thousand, twelve".