20813016 has 32 divisors (see below), whose sum is σ = 59466240. Its totient is φ = 5946528.

The previous prime is 20813003. The next prime is 20813021. The reversal of 20813016 is 61031802.

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

It is a junction number, because it is equal to n+sod(n) for n = 20812983 and 20813001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61776 + ... + 62111.

It is an arithmetic number, because the mean of its divisors is an integer number (1858320).

Almost surely, 2^20813016 is an apocalyptic number.

It is an amenable number.

20813016 is an abundant number, since it is smaller than the sum of its proper divisors (38653224).

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

20813016 is a wasteful number, since it uses less digits than its factorization.

20813016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123903 (or 123899 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20813016 is about 4562.1284506248. The cubic root of 20813016 is about 275.0711265057.

Adding to 20813016 its reverse (61031802), we get a palindrome (81844818).

The spelling of 20813016 in words is "twenty million, eight hundred thirteen thousand, sixteen".