20831016 has 16 divisors (see below), whose sum is σ = 52077600. Its totient is φ = 6943664.

The previous prime is 20831009. The next prime is 20831017. The reversal of 20831016 is 61013802.

It is a junction number, because it is equal to n+sod(n) for n = 20830983 and 20831001.

It is not an unprimeable number, because it can be changed into a prime (20831017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433956 + ... + 434003.

It is an arithmetic number, because the mean of its divisors is an integer number (3254850).

Almost surely, 2^20831016 is an apocalyptic number.

It is an amenable number.

20831016 is an abundant number, since it is smaller than the sum of its proper divisors (31246584).

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

20831016 is a wasteful number, since it uses less digits than its factorization.

20831016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867968 (or 867964 counting only the distinct ones).

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

The square root of 20831016 is about 4564.1007876689. The cubic root of 20831016 is about 275.1504014748.

Adding to 20831016 its reverse (61013802), we get a palindrome (81844818).

The spelling of 20831016 in words is "twenty million, eight hundred thirty-one thousand, sixteen".