20563542 has 24 divisors (see below), whose sum is σ = 45121440. Its totient is φ = 6767280.

The previous prime is 20563537. The next prime is 20563549. The reversal of 20563542 is 24536502.

20563542 is a `hidden beast` number, since 20 + 5 + 635 + 4 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5809 + ... + 8652.

It is an arithmetic number, because the mean of its divisors is an integer number (1880060).

Almost surely, 2^20563542 is an apocalyptic number.

20563542 is an abundant number, since it is smaller than the sum of its proper divisors (24557898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20563542 is a wasteful number, since it uses less digits than its factorization.

20563542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14548 (or 14545 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20563542 is about 4534.7041799879. The cubic root of 20563542 is about 273.9676645025.

It can be divided in two parts, 2056354 and 2, that added together give a square (2056356 = 1434²).

The spelling of 20563542 in words is "twenty million, five hundred sixty-three thousand, five hundred forty-two".