20511055 has 16 divisors (see below), whose sum is σ = 26127360. Its totient is φ = 15424288.

The previous prime is 20511047. The next prime is 20511083. The reversal of 20511055 is 55011502.

It is a cyclic number.

It is not a de Polignac number, because 20511055 - 2³ = 20511047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5274 + ... + 8296.

It is an arithmetic number, because the mean of its divisors is an integer number (1632960).

Almost surely, 2^20511055 is an apocalyptic number.

20511055 is a deficient number, since it is larger than the sum of its proper divisors (5616305).

20511055 is a wasteful number, since it uses less digits than its factorization.

20511055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 20511055 is about 4528.9132250464. The cubic root of 20511055 is about 273.7343714798.

Adding to 20511055 its reverse (55011502), we get a palindrome (75522557).

The spelling of 20511055 in words is "twenty million, five hundred eleven thousand, fifty-five".