20918064 has 40 divisors (see below), whose sum is σ = 54575872. Its totient is φ = 6903360.

The previous prime is 20918047. The next prime is 20918071. The reversal of 20918064 is 46081902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2829 + ... + 7059.

Almost surely, 2^20918064 is an apocalyptic number.

20918064 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 20918064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27287936).

20918064 is an abundant number, since it is smaller than the sum of its proper divisors (33657808).

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

20918064 is a wasteful number, since it uses less digits than its factorization.

20918064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4345 (or 4339 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20918064 is about 4573.6270070919. The cubic root of 20918064 is about 275.5331321600.

Adding to 20918064 its reverse (46081902), we get a palindrome (66999966).

The spelling of 20918064 in words is "twenty million, nine hundred eighteen thousand, sixty-four".