20542635 has 12 divisors (see below), whose sum is σ = 35607312. Its totient is φ = 10956048.

The previous prime is 20542633. The next prime is 20542649. The reversal of 20542635 is 53624502.

20542635 is a `hidden beast` number, since 20 + 5 + 4 + 2 + 635 = 666.

It is not a de Polignac number, because 20542635 - 2¹ = 20542633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20542599 and 20542608.

It is not an unprimeable number, because it can be changed into a prime (20542633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228207 + ... + 228296.

It is an arithmetic number, because the mean of its divisors is an integer number (2967276).

Almost surely, 2^20542635 is an apocalyptic number.

20542635 is a deficient number, since it is larger than the sum of its proper divisors (15064677).

20542635 is a wasteful number, since it uses less digits than its factorization.

20542635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456514 (or 456511 counting only the distinct ones).

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

The square root of 20542635 is about 4532.3983717233. The cubic root of 20542635 is about 273.8747851689.

The spelling of 20542635 in words is "twenty million, five hundred forty-two thousand, six hundred thirty-five".