20680704 has 208 divisors, whose sum is σ = 70770240. Its totient is φ = 5898240.

The previous prime is 20680697. The next prime is 20680711. The reversal of 20680704 is 40708602.

It is an interprime number because it is at equal distance from previous prime (20680697) and next prime (20680711).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1216504 + ... + 1216520.

Almost surely, 2^20680704 is an apocalyptic number.

20680704 is a gapful number since it is divisible by the number (24) 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 20680704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35385120).

20680704 is an abundant number, since it is smaller than the sum of its proper divisors (50089536).

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

20680704 is a wasteful number, since it uses less digits than its factorization.

20680704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20680704 is about 4547.6042044136. The cubic root of 20680704 is about 274.4869951138.

The spelling of 20680704 in words is "twenty million, six hundred eighty thousand, seven hundred four".