20396880 has 320 divisors, whose sum is σ = 85708800. Its totient is φ = 4354560.

The previous prime is 20396867. The next prime is 20396933. The reversal of 20396880 is 8869302.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 287245 + ... + 287315.

It is an arithmetic number, because the mean of its divisors is an integer number (267840).

Almost surely, 2^20396880 is an apocalyptic number.

20396880 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 20396880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42854400).

20396880 is an abundant number, since it is smaller than the sum of its proper divisors (65311920).

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

20396880 is a wasteful number, since it uses less digits than its factorization.

20396880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20396880 is about 4516.2905132420. The cubic root of 20396880 is about 273.2255110454.

20396880 divided by its sum of digits (36) gives a triangular number (566580 = T₁₀₆₄).

It can be divided in two parts, 20 and 396880, that added together give a square (396900 = 630²).

The spelling of 20396880 in words is "twenty million, three hundred ninety-six thousand, eight hundred eighty".