20747660 has 24 divisors (see below), whose sum is σ = 43754256. Its totient is φ = 8264000.

The previous prime is 20747653. The next prime is 20747663. The reversal of 20747660 is 6674702.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20747663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2954 + ... + 7086.

It is an arithmetic number, because the mean of its divisors is an integer number (1823094).

Almost surely, 2^20747660 is an apocalyptic number.

20747660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20747660 is an abundant number, since it is smaller than the sum of its proper divisors (23006596).

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

20747660 is a wasteful number, since it uses less digits than its factorization.

20747660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393 (or 4391 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 20747660 is about 4554.9599339621. The cubic root of 20747660 is about 274.7829030395.

The spelling of 20747660 in words is "twenty million, seven hundred forty-seven thousand, six hundred sixty".