20540724 has 24 divisors (see below), whose sum is σ = 49475328. Its totient is φ = 6625920.

The previous prime is 20540719. The next prime is 20540731. The reversal of 20540724 is 42704502.

It is a junction number, because it is equal to n+sod(n) for n = 20540694 and 20540703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27237 + ... + 27980.

It is an arithmetic number, because the mean of its divisors is an integer number (2061472).

Almost surely, 2^20540724 is an apocalyptic number.

It is an amenable number.

20540724 is an abundant number, since it is smaller than the sum of its proper divisors (28934604).

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

20540724 is a wasteful number, since it uses less digits than its factorization.

20540724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55255 (or 55253 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 20540724 is about 4532.1875512825. The cubic root of 20540724 is about 273.8662924099.

The spelling of 20540724 in words is "twenty million, five hundred forty thousand, seven hundred twenty-four".