20062640 has 80 divisors (see below), whose sum is σ = 50996736. Its totient is φ = 7296000.

The previous prime is 20062597. The next prime is 20062657. The reversal of 20062640 is 4626002.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104945 + ... + 105135.

Almost surely, 2^20062640 is an apocalyptic number.

20062640 is a gapful number since it is divisible by the number (20) 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 20062640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25498368).

20062640 is an abundant number, since it is smaller than the sum of its proper divisors (30934096).

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

20062640 is a wasteful number, since it uses less digits than its factorization.

20062640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20062640 is about 4479.1338448410. The cubic root of 20062640 is about 271.7248515182.

Adding to 20062640 its reverse (4626002), we get a palindrome (24688642).

It can be divided in two parts, 20062 and 640, that added together give a palindrome (20702).

The spelling of 20062640 in words is "twenty million, sixty-two thousand, six hundred forty".