20027940 has 72 divisors (see below), whose sum is σ = 58715328. Its totient is φ = 5100480.

The previous prime is 20027933. The next prime is 20027941. The reversal of 20027940 is 4972002.

It is a super-2 number, since 2×20027940² = 802236761287200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20027940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20027941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31425 + ... + 32055.

Almost surely, 2^20027940 is an apocalyptic number.

20027940 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 20027940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29357664).

20027940 is an abundant number, since it is smaller than the sum of its proper divisors (38687388).

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

20027940 is a wasteful number, since it uses less digits than its factorization.

20027940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20027940 is about 4475.2586517429. The cubic root of 20027940 is about 271.5681042246.

Adding to 20027940 its reverse (4972002), we get a palindrome (24999942).

The spelling of 20027940 in words is "twenty million, twenty-seven thousand, nine hundred forty".