20550555 has 12 divisors (see below), whose sum is σ = 35621040. Its totient is φ = 10960272.

The previous prime is 20550547. The next prime is 20550587. The reversal of 20550555 is 55505502.

It is a happy number.

It is not a de Polignac number, because 20550555 - 2³ = 20550547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228295 + ... + 228384.

It is an arithmetic number, because the mean of its divisors is an integer number (2968420).

Almost surely, 2^20550555 is an apocalyptic number.

20550555 is a deficient number, since it is larger than the sum of its proper divisors (15070485).

20550555 is a wasteful number, since it uses less digits than its factorization.

20550555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456690 (or 456687 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 27.

The square root of 20550555 is about 4533.2719971341. The cubic root of 20550555 is about 273.9099771749.

The spelling of 20550555 in words is "twenty million, five hundred fifty thousand, five hundred fifty-five".