20113380 has 192 divisors, whose sum is σ = 75962880. Its totient is φ = 4313088.

The previous prime is 20113367. The next prime is 20113391. The reversal of 20113380 is 8331102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 64104 + ... + 64416.

It is an arithmetic number, because the mean of its divisors is an integer number (395640).

Almost surely, 2^20113380 is an apocalyptic number.

20113380 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 20113380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37981440).

20113380 is an abundant number, since it is smaller than the sum of its proper divisors (55849500).

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

20113380 is a wasteful number, since it uses less digits than its factorization.

20113380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20113380 is about 4484.7943096646. The cubic root of 20113380 is about 271.9537298745.

Adding to 20113380 its reverse (8331102), we get a palindrome (28444482).

The spelling of 20113380 in words is "twenty million, one hundred thirteen thousand, three hundred eighty".