20820016 has 20 divisors (see below), whose sum is σ = 46101712. Its totient is φ = 8922816.

The previous prime is 20820001. The next prime is 20820017. The reversal of 20820016 is 61002802.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20819975 and 20820002.

It is not an unprimeable number, because it can be changed into a prime (20820017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92835 + ... + 93058.

Almost surely, 2^20820016 is an apocalyptic number.

It is an amenable number.

20820016 is an abundant number, since it is smaller than the sum of its proper divisors (25281696).

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

20820016 is a wasteful number, since it uses less digits than its factorization.

20820016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185908 (or 185902 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 20820016 is about 4562.8955718929. The cubic root of 20820016 is about 275.1019610895.

Adding to 20820016 its reverse (61002802), we get a palindrome (81822818).

The spelling of 20820016 in words is "twenty million, eight hundred twenty thousand, sixteen".