20764506 has 64 divisors (see below), whose sum is σ = 49508352. Its totient is φ = 5683392.

The previous prime is 20764487. The next prime is 20764507. The reversal of 20764506 is 60546702.

20764506 is nontrivially palindromic in base 12.

It is not an unprimeable number, because it can be changed into a prime (20764507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132180 + ... + 132336.

It is an arithmetic number, because the mean of its divisors is an integer number (773568).

Almost surely, 2^20764506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20764506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24754176).

20764506 is an abundant number, since it is smaller than the sum of its proper divisors (28743846).

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

20764506 is a wasteful number, since it uses less digits than its factorization.

20764506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 20764506 is about 4556.8087517472. The cubic root of 20764506 is about 274.8572526371.

The spelling of 20764506 in words is "twenty million, seven hundred sixty-four thousand, five hundred six".