20402824 has 16 divisors (see below), whose sum is σ = 41198220. Its totient is φ = 9416640.

The previous prime is 20402813. The next prime is 20402831. The reversal of 20402824 is 42820402.

It can be written as a sum of positive squares in 2 ways, for example, as 19624900 + 777924 = 4430^2 + 882^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20402795 and 20402804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97987 + ... + 98194.

Almost surely, 2^20402824 is an apocalyptic number.

It is an amenable number.

20402824 is an abundant number, since it is smaller than the sum of its proper divisors (20795396).

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

20402824 is a wasteful number, since it uses less digits than its factorization.

20402824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196200 (or 196196 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 20402824 is about 4516.9485274907. The cubic root of 20402824 is about 273.2520493313.

The spelling of 20402824 in words is "twenty million, four hundred two thousand, eight hundred twenty-four".