20743776 has 120 divisors (see below), whose sum is σ = 62569584. Its totient is φ = 6739200.

The previous prime is 20743771. The next prime is 20743781. The reversal of 20743776 is 67734702.

It is an interprime number because it is at equal distance from previous prime (20743771) and next prime (20743781).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20743776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20743771) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 137301 + ... + 137451.

Almost surely, 2^20743776 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 20743776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31284792).

20743776 is an abundant number, since it is smaller than the sum of its proper divisors (41825808).

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

20743776 is a wasteful number, since it uses less digits than its factorization.

20743776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 36.

The square root of 20743776 is about 4554.5335655806. The cubic root of 20743776 is about 274.7657553483.

The spelling of 20743776 in words is "twenty million, seven hundred forty-three thousand, seven hundred seventy-six".