20747560 has 16 divisors (see below), whose sum is σ = 46682100. Its totient is φ = 8299008.

The previous prime is 20747537. The next prime is 20747567. The reversal of 20747560 is 6574702.

It can be written as a sum of positive squares in 2 ways, for example, as 18957316 + 1790244 = 4354^2 + 1338^2 .

It is a super-2 number, since 2×20747560² = 860922491907200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20747567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259305 + ... + 259384.

Almost surely, 2^20747560 is an apocalyptic number.

20747560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20747560 is an abundant number, since it is smaller than the sum of its proper divisors (25934540).

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

20747560 is a wasteful number, since it uses less digits than its factorization.

20747560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518700 (or 518696 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 20747560 is about 4554.9489569039. The cubic root of 20747560 is about 274.7824615707.

The spelling of 20747560 in words is "twenty million, seven hundred forty-seven thousand, five hundred sixty".