20550545 has 8 divisors (see below), whose sum is σ = 24938280. Its totient is φ = 16255360.

The previous prime is 20550529. The next prime is 20550547. The reversal of 20550545 is 54505502.

It can be written as a sum of positive squares in 4 ways, for example, as 1957201 + 18593344 = 1399^2 + 4312^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20550545 - 2⁴ = 20550529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20550547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22646 + ... + 23535.

It is an arithmetic number, because the mean of its divisors is an integer number (3117285).

Almost surely, 2^20550545 is an apocalyptic number.

It is an amenable number.

20550545 is a deficient number, since it is larger than the sum of its proper divisors (4387735).

20550545 is an equidigital number, since it uses as much as digits as its factorization.

20550545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46275.

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 20550545 is about 4533.2708941778. The cubic root of 20550545 is about 273.9099327463.

The spelling of 20550545 in words is "twenty million, five hundred fifty thousand, five hundred forty-five".