20172648 has 32 divisors (see below), whose sum is σ = 51386400. Its totient is φ = 6596928.

The previous prime is 20172643. The next prime is 20172667. The reversal of 20172648 is 84627102.

It is not an unprimeable number, because it can be changed into a prime (20172641) 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, 6658 + ... + 9201.

It is an arithmetic number, because the mean of its divisors is an integer number (1605825).

Almost surely, 2^20172648 is an apocalyptic number.

It is an amenable number.

20172648 is an abundant number, since it is smaller than the sum of its proper divisors (31213752).

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

20172648 is a wasteful number, since it uses less digits than its factorization.

20172648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15921 (or 15917 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20172648 is about 4491.3971100316. The cubic root of 20172648 is about 272.2205895100.

The spelling of 20172648 in words is "twenty million, one hundred seventy-two thousand, six hundred forty-eight".