20021916 has 24 divisors (see below), whose sum is σ = 47600784. Its totient is φ = 6547840.

The previous prime is 20021887. The next prime is 20021917. The reversal of 20021916 is 61912002.

It is a super-2 number, since 2×20021916² = 801754240622112, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20021892 and 20021901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15105 + ... + 16376.

It is an arithmetic number, because the mean of its divisors is an integer number (1983366).

Almost surely, 2^20021916 is an apocalyptic number.

It is an amenable number.

20021916 is an abundant number, since it is smaller than the sum of its proper divisors (27578868).

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

20021916 is a wasteful number, since it uses less digits than its factorization.

20021916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31541 (or 31539 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 20021916 is about 4474.5855674017. The cubic root of 20021916 is about 271.5408740933.

Adding to 20021916 its reverse (61912002), we get a palindrome (81933918).

The spelling of 20021916 in words is "twenty million, twenty-one thousand, nine hundred sixteen".