20655523 has 16 divisors (see below), whose sum is σ = 24361216. Its totient is φ = 17146080.

The previous prime is 20655473. The next prime is 20655529. The reversal of 20655523 is 32555602.

It is not a de Polignac number, because 20655523 - 2¹⁷ = 20524451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20655491 and 20655500.

It is not an unprimeable number, because it can be changed into a prime (20655529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48853 + ... + 49273.

It is an arithmetic number, because the mean of its divisors is an integer number (1522576).

Almost surely, 2^20655523 is an apocalyptic number.

20655523 is a deficient number, since it is larger than the sum of its proper divisors (3705693).

20655523 is a wasteful number, since it uses less digits than its factorization.

20655523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 20655523 is about 4544.8347604726. The cubic root of 20655523 is about 274.3755439718.

The spelling of 20655523 in words is "twenty million, six hundred fifty-five thousand, five hundred twenty-three".