20013786 has 72 divisors (see below), whose sum is σ = 48796020. Its totient is φ = 5892480.

The previous prime is 20013779. The next prime is 20013793. The reversal of 20013786 is 68731002.

It is an interprime number because it is at equal distance from previous prime (20013779) and next prime (20013793).

It can be written as a sum of positive squares in 2 ways, for example, as 17514225 + 2499561 = 4185^2 + 1581^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 224830 + ... + 224918.

Almost surely, 2^20013786 is an apocalyptic number.

20013786 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20013786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24398010).

20013786 is an abundant number, since it is smaller than the sum of its proper divisors (28782234).

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

20013786 is a wasteful number, since it uses less digits than its factorization.

20013786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20013786 is about 4473.6770111397. The cubic root of 20013786 is about 271.5041156036.

Adding to 20013786 its reverse (68731002), we get a palindrome (88744788).

The spelling of 20013786 in words is "twenty million, thirteen thousand, seven hundred eighty-six".