20813634 has 24 divisors (see below), whose sum is σ = 46146672. Its totient is φ = 6776280.

The previous prime is 20813623. The next prime is 20813669. The reversal of 20813634 is 43631802.

It is a happy number.

20813634 is a `hidden beast` number, since 20 + 8 + 1 + 3 + 634 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20813598 and 20813607.

It is an unprimeable number.

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, 12672 + ... + 14219.

It is an arithmetic number, because the mean of its divisors is an integer number (1922778).

Almost surely, 2^20813634 is an apocalyptic number.

20813634 is an abundant number, since it is smaller than the sum of its proper divisors (25333038).

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

20813634 is a wasteful number, since it uses less digits than its factorization.

20813634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26942 (or 26939 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20813634 is about 4562.1961816651. The cubic root of 20813634 is about 275.0738490372.

The spelling of 20813634 in words is "twenty million, eight hundred thirteen thousand, six hundred thirty-four".