20491648 has 16 divisors (see below), whose sum is σ = 40823460. Its totient is φ = 10245760.

The previous prime is 20491631. The next prime is 20491699. The reversal of 20491648 is 84619402.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79918 + ... + 80173.

Almost surely, 2^20491648 is an apocalyptic number.

It is an amenable number.

20491648 is a deficient number, since it is larger than the sum of its proper divisors (20331812).

20491648 is an equidigital number, since it uses as much as digits as its factorization.

20491648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160105 (or 160093 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20491648 is about 4526.7701510017. The cubic root of 20491648 is about 273.6480109082.

The spelling of 20491648 in words is "twenty million, four hundred ninety-one thousand, six hundred forty-eight".