20678736 has 80 divisors (see below), whose sum is σ = 59440640. Its totient is φ = 6151680.

The previous prime is 20678699. The next prime is 20678737. The reversal of 20678736 is 63787602.

It is a super-2 number, since 2×20678736² = 855220245115392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 20678694 and 20678703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18810 + ... + 19878.

It is an arithmetic number, because the mean of its divisors is an integer number (743008).

Almost surely, 2^20678736 is an apocalyptic number.

20678736 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20678736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29720320).

20678736 is an abundant number, since it is smaller than the sum of its proper divisors (38761904).

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

20678736 is a wasteful number, since it uses less digits than its factorization.

20678736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124 (or 1118 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 20678736 is about 4547.3878215960. The cubic root of 20678736 is about 274.4782880030.

The spelling of 20678736 in words is "twenty million, six hundred seventy-eight thousand, seven hundred thirty-six".