20051616 has 48 divisors (see below), whose sum is σ = 56687904. Its totient is φ = 6169344.

The previous prime is 20051609. The next prime is 20051617. The reversal of 20051616 is 61615002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×20051616² = 804134608422912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20051592 and 20051601.

It is not an unprimeable number, because it can be changed into a prime (20051617) 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, 6786 + ... + 9281.

It is an arithmetic number, because the mean of its divisors is an integer number (1180998).

Almost surely, 2^20051616 is an apocalyptic number.

20051616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20051616 is an abundant number, since it is smaller than the sum of its proper divisors (36636288).

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

20051616 is a wasteful number, since it uses less digits than its factorization.

20051616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16093 (or 16085 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20051616 is about 4477.9030806841. The cubic root of 20051616 is about 271.6750733637.

Adding to 20051616 its reverse (61615002), we get a palindrome (81666618).

The spelling of 20051616 in words is "twenty million, fifty-one thousand, six hundred sixteen".