20746506 has 64 divisors (see below), whose sum is σ = 48107520. Its totient is φ = 5903040.

The previous prime is 20746501. The next prime is 20746507. The reversal of 20746506 is 60564702.

It is a super-2 number, since 2×20746506² = 860835022416072, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20746501) 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, 119836 + ... + 120008.

It is an arithmetic number, because the mean of its divisors is an integer number (751680).

Almost surely, 2^20746506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20746506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24053760).

20746506 is an abundant number, since it is smaller than the sum of its proper divisors (27361014).

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

20746506 is a wasteful number, since it uses less digits than its factorization.

20746506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291.

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

The square root of 20746506 is about 4554.8332571017. The cubic root of 20746506 is about 274.7778084031. Note that the first 3 decimals are identical.

The spelling of 20746506 in words is "twenty million, seven hundred forty-six thousand, five hundred six".