20740556 has 6 divisors (see below), whose sum is σ = 36295980. Its totient is φ = 10370276.

The previous prime is 20740553. The next prime is 20740579. The reversal of 20740556 is 65504702.

It is not an unprimeable number, because it can be changed into a prime (20740553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2592566 + ... + 2592573.

It is an arithmetic number, because the mean of its divisors is an integer number (6049330).

Almost surely, 2^20740556 is an apocalyptic number.

It is an amenable number.

20740556 is a deficient number, since it is larger than the sum of its proper divisors (15555424).

20740556 is a wasteful number, since it uses less digits than its factorization.

20740556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5185143 (or 5185141 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 20740556 is about 4554.1800579248. The cubic root of 20740556 is about 274.7515375653.

The spelling of 20740556 in words is "twenty million, seven hundred forty thousand, five hundred fifty-six".