20012916 has 96 divisors (see below), whose sum is σ = 59028480. Its totient is φ = 5169120.

The previous prime is 20012903. The next prime is 20012917. The reversal of 20012916 is 61921002.

20012916 = T₁₃₉ + T₁₄₀ + ... + T₄₉₆.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20012892 and 20012901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111715 + ... + 111893.

It is an arithmetic number, because the mean of its divisors is an integer number (614880).

Almost surely, 2^20012916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20012916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29514240).

20012916 is an abundant number, since it is smaller than the sum of its proper divisors (39015564).

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

20012916 is a wasteful number, since it uses less digits than its factorization.

20012916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 202 counting only the distinct ones).

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

The square root of 20012916 is about 4473.5797746324. The cubic root of 20012916 is about 271.5001814487.

Adding to 20012916 its reverse (61921002), we get a palindrome (81933918).

The spelling of 20012916 in words is "twenty million, twelve thousand, nine hundred sixteen".