20380416 has 144 divisors (see below), whose sum is σ = 65931264. Its totient is φ = 5455872.

The previous prime is 20380343. The next prime is 20380427. The reversal of 20380416 is 61408302.

It is a happy number.

It is a super-2 number, since 2×20380416² = 830722712666112, which contains 22 as substring.

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

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, 91281 + ... + 91503.

It is an arithmetic number, because the mean of its divisors is an integer number (457856).

Almost surely, 2^20380416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20380416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32965632).

20380416 is an abundant number, since it is smaller than the sum of its proper divisors (45550848).

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

20380416 is a wasteful number, since it uses less digits than its factorization.

20380416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20380416 is about 4514.4674104483. The cubic root of 20380416 is about 273.1519769935.

Adding to 20380416 its reverse (61408302), we get a palindrome (81788718).

The spelling of 20380416 in words is "twenty million, three hundred eighty thousand, four hundred sixteen".