20629880 has 64 divisors (see below), whose sum is σ = 48660480. Its totient is φ = 7862400.

The previous prime is 20629867. The next prime is 20629883. The reversal of 20629880 is 8892602.

It is a self number, because there is not a number n which added to its sum of digits gives 20629880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20629883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157415 + ... + 157545.

It is an arithmetic number, because the mean of its divisors is an integer number (760320).

Almost surely, 2^20629880 is an apocalyptic number.

20629880 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 20629880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24330240).

20629880 is an abundant number, since it is smaller than the sum of its proper divisors (28030600).

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

20629880 is a wasteful number, since it uses less digits than its factorization.

20629880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20629880 is about 4542.0127696870. The cubic root of 20629880 is about 274.2619548905.

The spelling of 20629880 in words is "twenty million, six hundred twenty-nine thousand, eight hundred eighty".