20813835 has 32 divisors (see below), whose sum is σ = 40066560. Its totient is φ = 9013248.

The previous prime is 20813813. The next prime is 20813839. The reversal of 20813835 is 53831802.

It is a happy number.

It is not a de Polignac number, because 20813835 - 2⁹ = 20813323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20813839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3222 + ... + 7211.

It is an arithmetic number, because the mean of its divisors is an integer number (1252080).

Almost surely, 2^20813835 is an apocalyptic number.

20813835 is a deficient number, since it is larger than the sum of its proper divisors (19252725).

20813835 is a wasteful number, since it uses less digits than its factorization.

20813835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10467.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20813835 is about 4562.2182104761. The cubic root of 20813835 is about 275.0747345091.

The spelling of 20813835 in words is "twenty million, eight hundred thirteen thousand, eight hundred thirty-five".