20735213 has 12 divisors (see below), whose sum is σ = 22827840. Its totient is φ = 18780696.

The previous prime is 20735201. The next prime is 20735293. The reversal of 20735213 is 31253702.

It is not a de Polignac number, because 20735213 - 2⁶ = 20735149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20735293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9020 + ... + 11082.

It is an arithmetic number, because the mean of its divisors is an integer number (1902320).

Almost surely, 2^20735213 is an apocalyptic number.

20735213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20735213 is a deficient number, since it is larger than the sum of its proper divisors (2092627).

20735213 is a wasteful number, since it uses less digits than its factorization.

20735213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128 (or 2105 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20735213 is about 4553.5934161934. The cubic root of 20735213 is about 274.7279425125.

Adding to 20735213 its reverse (31253702), we get a palindrome (51988915).

The spelling of 20735213 in words is "twenty million, seven hundred thirty-five thousand, two hundred thirteen".