20455605 has 16 divisors (see below), whose sum is σ = 36365760. Its totient is φ = 10909584.

The previous prime is 20455601. The next prime is 20455627. The reversal of 20455605 is 50655402.

20455605 is a `hidden beast` number, since 2 + 0 + 4 + 55 + 605 = 666.

It is not a de Polignac number, because 20455605 - 2² = 20455601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20455601) 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, 75627 + ... + 75896.

It is an arithmetic number, because the mean of its divisors is an integer number (2272860).

Almost surely, 2^20455605 is an apocalyptic number.

It is an amenable number.

20455605 is a deficient number, since it is larger than the sum of its proper divisors (15910155).

20455605 is a wasteful number, since it uses less digits than its factorization.

20455605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151537 (or 151531 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 20455605 is about 4522.7873043069. The cubic root of 20455605 is about 273.4874758505.

It can be divided in two parts, 20 and 455605, that added together give a square (455625 = 675²).

The spelling of 20455605 in words is "twenty million, four hundred fifty-five thousand, six hundred five".