20191648 has 24 divisors (see below), whose sum is σ = 42091812. Its totient is φ = 9501696.

The previous prime is 20191643. The next prime is 20191651. The reversal of 20191648 is 84619102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19465744 + 725904 = 4412^2 + 852^2 .

It is not an unprimeable number, because it can be changed into a prime (20191643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18015 + ... + 19102.

Almost surely, 2^20191648 is an apocalyptic number.

It is an amenable number.

20191648 is an abundant number, since it is smaller than the sum of its proper divisors (21900164).

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

20191648 is a wasteful number, since it uses less digits than its factorization.

20191648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37144 (or 37136 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20191648 is about 4493.5117669814. The cubic root of 20191648 is about 272.3060281066.

The spelling of 20191648 in words is "twenty million, one hundred ninety-one thousand, six hundred forty-eight".