20946813 has 24 divisors (see below), whose sum is σ = 29782368. Its totient is φ = 13091232.

The previous prime is 20946803. The next prime is 20946817. The reversal of 20946813 is 31864902.

It is not a de Polignac number, because 20946813 - 2⁵ = 20946781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20946817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106231 + ... + 106427.

It is an arithmetic number, because the mean of its divisors is an integer number (1240932).

Almost surely, 2^20946813 is an apocalyptic number.

20946813 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20946813 is a deficient number, since it is larger than the sum of its proper divisors (8835555).

20946813 is a wasteful number, since it uses less digits than its factorization.

20946813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20946813 is about 4576.7688383837. The cubic root of 20946813 is about 275.6593018328.

The spelling of 20946813 in words is "twenty million, nine hundred forty-six thousand, eight hundred thirteen".