20801235 has 64 divisors (see below), whose sum is σ = 41932800. Its totient is φ = 8749440.

The previous prime is 20801191. The next prime is 20801243. The reversal of 20801235 is 53210802.

It is not a de Polignac number, because 20801235 - 2⁶ = 20801171 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66730 + ... + 67040.

It is an arithmetic number, because the mean of its divisors is an integer number (655200).

Almost surely, 2^20801235 is an apocalyptic number.

20801235 is an abundant number, since it is smaller than the sum of its proper divisors (21131565).

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

20801235 is a wasteful number, since it uses less digits than its factorization.

20801235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20801235 is about 4560.8370942186. The cubic root of 20801235 is about 275.0192162880.

The spelling of 20801235 in words is "twenty million, eight hundred one thousand, two hundred thirty-five".