20740860 has 240 divisors, whose sum is σ = 78059520. Its totient is φ = 4510080.

The previous prime is 20740849. The next prime is 20740873. The reversal of 20740860 is 6804702.

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 79 ways as a sum of consecutive naturals, for example, 351511 + ... + 351569.

It is an arithmetic number, because the mean of its divisors is an integer number (325248).

Almost surely, 2^20740860 is an apocalyptic number.

20740860 is a gapful number since it is divisible by the number (20) 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 20740860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39029760).

20740860 is an abundant number, since it is smaller than the sum of its proper divisors (57318660).

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

20740860 is a wasteful number, since it uses less digits than its factorization.

20740860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 107 counting only the distinct ones).

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

The square root of 20740860 is about 4554.2134337336. The cubic root of 20740860 is about 274.7528799282.

20740860 divided by its sum of digits (27) gives a triangular number (768180 = T₁₂₃₉).

The spelling of 20740860 in words is "twenty million, seven hundred forty thousand, eight hundred sixty".