20641992 has 32 divisors (see below), whose sum is σ = 58977600. Its totient is φ = 5897664.

The previous prime is 20641987. The next prime is 20641993. The reversal of 20641992 is 29914602.

It is not an unprimeable number, because it can be changed into a prime (20641993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61267 + ... + 61602.

It is an arithmetic number, because the mean of its divisors is an integer number (1843050).

Almost surely, 2^20641992 is an apocalyptic number.

It is an amenable number.

20641992 is an abundant number, since it is smaller than the sum of its proper divisors (38335608).

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

20641992 is a wasteful number, since it uses less digits than its factorization.

20641992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122885 (or 122881 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20641992 is about 4543.3459036265. The cubic root of 20641992 is about 274.3156183294.

The spelling of 20641992 in words is "twenty million, six hundred forty-one thousand, nine hundred ninety-two".