20072840 has 16 divisors (see below), whose sum is σ = 45163980. Its totient is φ = 8029120.

The previous prime is 20072839. The next prime is 20072867. The reversal of 20072840 is 4827002.

It can be written as a sum of positive squares in 2 ways, for example, as 19695844 + 376996 = 4438^2 + 614^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250871 + ... + 250950.

Almost surely, 2^20072840 is an apocalyptic number.

20072840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20072840 is an abundant number, since it is smaller than the sum of its proper divisors (25091140).

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

20072840 is a wasteful number, since it uses less digits than its factorization.

20072840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501832 (or 501828 counting only the distinct ones).

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

The square root of 20072840 is about 4480.2723131524. The cubic root of 20072840 is about 271.7708927158.

Adding to 20072840 its reverse (4827002), we get a palindrome (24899842).

The spelling of 20072840 in words is "twenty million, seventy-two thousand, eight hundred forty".