20813435 has 4 divisors (see below), whose sum is σ = 24976128. Its totient is φ = 16650744.

The previous prime is 20813399. The next prime is 20813447. The reversal of 20813435 is 53431802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20813435 - 2¹⁶ = 20747899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081339 + ... + 2081348.

It is an arithmetic number, because the mean of its divisors is an integer number (6244032).

Almost surely, 2^20813435 is an apocalyptic number.

20813435 is a deficient number, since it is larger than the sum of its proper divisors (4162693).

20813435 is an equidigital number, since it uses as much as digits as its factorization.

20813435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4162692.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20813435 is about 4562.1743719415. The cubic root of 20813435 is about 275.0729723703.

The spelling of 20813435 in words is "twenty million, eight hundred thirteen thousand, four hundred thirty-five".