20550747 has 12 divisors (see below), whose sum is σ = 31874856. Its totient is φ = 11743200.

The previous prime is 20550721. The next prime is 20550757. The reversal of 20550747 is 74705502.

It is not a de Polignac number, because 20550747 - 2¹² = 20546651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20550757) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 69754 + ... + 70047.

It is an arithmetic number, because the mean of its divisors is an integer number (2656238).

Almost surely, 2^20550747 is an apocalyptic number.

20550747 is a deficient number, since it is larger than the sum of its proper divisors (11324109).

20550747 is a wasteful number, since it uses less digits than its factorization.

20550747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139818 (or 139811 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 30.

The square root of 20550747 is about 4533.2931738417. The cubic root of 20550747 is about 273.9108302022.

The spelling of 20550747 in words is "twenty million, five hundred fifty thousand, seven hundred forty-seven".