20651064 has 64 divisors (see below), whose sum is σ = 59754240. Its totient is φ = 5825280.

The previous prime is 20651063. The next prime is 20651077. The reversal of 20651064 is 46015602.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13204 + ... + 14684.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^20651064 is an apocalyptic number.

20651064 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 20651064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29877120).

20651064 is an abundant number, since it is smaller than the sum of its proper divisors (39103176).

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

20651064 is a wasteful number, since it uses less digits than its factorization.

20651064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 1576 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20651064 is about 4544.3441771063. The cubic root of 20651064 is about 274.3557989929.

Adding to 20651064 its reverse (46015602), we get a palindrome (66666666).

The spelling of 20651064 in words is "twenty million, six hundred fifty-one thousand, sixty-four".