20027840 has 56 divisors (see below), whose sum is σ = 54510432. Its totient is φ = 6865920.

The previous prime is 20027801. The next prime is 20027851. The reversal of 20027840 is 4872002.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×20027840² = 802228750131200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2231 + ... + 6710.

Almost surely, 2^20027840 is an apocalyptic number.

20027840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20027840 is an abundant number, since it is smaller than the sum of its proper divisors (34482592).

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

20027840 is an equidigital number, since it uses as much as digits as its factorization.

20027840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8965 (or 8955 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20027840 is about 4475.2474791904. The cubic root of 20027840 is about 271.5676522417.

Adding to 20027840 its reverse (4872002), we get a palindrome (24899842).

The spelling of 20027840 in words is "twenty million, twenty-seven thousand, eight hundred forty".