20813735 has 24 divisors (see below), whose sum is σ = 27306720. Its totient is φ = 15183168.

The previous prime is 20813731. The next prime is 20813753. The reversal of 20813735 is 53731802.

It is not a de Polignac number, because 20813735 - 2² = 20813731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 20813698 and 20813707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20813731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263426 + ... + 263504.

It is an arithmetic number, because the mean of its divisors is an integer number (1137780).

Almost surely, 2^20813735 is an apocalyptic number.

20813735 is a deficient number, since it is larger than the sum of its proper divisors (6492985).

20813735 is an equidigital number, since it uses as much as digits as its factorization.

20813735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20813735 is about 4562.2072508820. The cubic root of 20813735 is about 275.0742939765.

The spelling of 20813735 in words is "twenty million, eight hundred thirteen thousand, seven hundred thirty-five".