20508724 has 6 divisors (see below), whose sum is σ = 35890274. Its totient is φ = 10254360.

The previous prime is 20508707. The next prime is 20508731. The reversal of 20508724 is 42780502.

It can be written as a sum of positive squares in only one way, i.e., 16548624 + 3960100 = 4068^2 + 1990^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20508692 and 20508701.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2563587 + ... + 2563594.

Almost surely, 2^20508724 is an apocalyptic number.

It is an amenable number.

20508724 is a deficient number, since it is larger than the sum of its proper divisors (15381550).

20508724 is a wasteful number, since it uses less digits than its factorization.

20508724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5127185 (or 5127183 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 20508724 is about 4528.6558712271. The cubic root of 20508724 is about 273.7240014786.

The spelling of 20508724 in words is "twenty million, five hundred eight thousand, seven hundred twenty-four".