20723016 has 32 divisors (see below), whose sum is σ = 51924960. Its totient is φ = 6892032.

The previous prime is 20722993. The next prime is 20723029. The reversal of 20723016 is 61032702.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20722983 and 20723001.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15511 + ... + 16793.

It is an arithmetic number, because the mean of its divisors is an integer number (1622655).

Almost surely, 2^20723016 is an apocalyptic number.

It is an amenable number.

20723016 is an abundant number, since it is smaller than the sum of its proper divisors (31201944).

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

20723016 is a wasteful number, since it uses less digits than its factorization.

20723016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965 (or 1961 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20723016 is about 4552.2539472222. The cubic root of 20723016 is about 274.6740645361.

Adding to 20723016 its reverse (61032702), we get a palindrome (81755718).

The spelling of 20723016 in words is "twenty million, seven hundred twenty-three thousand, sixteen".