20550724 has 6 divisors (see below), whose sum is σ = 35963774. Its totient is φ = 10275360.

The previous prime is 20550721. The next prime is 20550757. The reversal of 20550724 is 42705502.

It can be written as a sum of positive squares in only one way, i.e., 20088324 + 462400 = 4482^2 + 680^2 .

It is not an unprimeable number, because it can be changed into a prime (20550721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2568837 + ... + 2568844.

Almost surely, 2^20550724 is an apocalyptic number.

It is an amenable number.

20550724 is a deficient number, since it is larger than the sum of its proper divisors (15413050).

20550724 is a wasteful number, since it uses less digits than its factorization.

20550724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5137685 (or 5137683 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20550724 is about 4533.2906370538. The cubic root of 20550724 is about 273.9107280169.

The spelling of 20550724 in words is "twenty million, five hundred fifty thousand, seven hundred twenty-four".