20906064 has 60 divisors (see below), whose sum is σ = 59951892. Its totient is φ = 6796800.

The previous prime is 20906051. The next prime is 20906087. The reversal of 20906064 is 46060902.

It can be written as a sum of positive squares in 2 ways, for example, as 4161600 + 16744464 = 2040^2 + 4092^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4134 + ... + 7674.

Almost surely, 2^20906064 is an apocalyptic number.

20906064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20906064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29975946).

20906064 is an abundant number, since it is smaller than the sum of its proper divisors (39045828).

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

20906064 is a wasteful number, since it uses less digits than its factorization.

20906064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3596 (or 3587 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20906064 is about 4572.3149497820. The cubic root of 20906064 is about 275.4804340065.

Adding to 20906064 its reverse (46060902), we get a palindrome (66966966).

The spelling of 20906064 in words is "twenty million, nine hundred six thousand, sixty-four".