20097644 has 18 divisors (see below), whose sum is σ = 40913460. Its totient is φ = 8613192.

The previous prime is 20097643. The next prime is 20097677. The reversal of 20097644 is 44679002.

It is a self number, because there is not a number n which added to its sum of digits gives 20097644.

It is not an unprimeable number, because it can be changed into a prime (20097643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51074 + ... + 51465.

It is an arithmetic number, because the mean of its divisors is an integer number (2272970).

Almost surely, 2^20097644 is an apocalyptic number.

It is an amenable number.

20097644 is an abundant number, since it is smaller than the sum of its proper divisors (20815816).

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

20097644 is a wasteful number, since it uses less digits than its factorization.

20097644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102557 (or 102548 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20097644 is about 4483.0395938470. The cubic root of 20097644 is about 271.8827890313.

The spelling of 20097644 in words is "twenty million, ninety-seven thousand, six hundred forty-four".