20481812 has 24 divisors (see below), whose sum is σ = 38756256. Its totient is φ = 9415008.

The previous prime is 20481767. The next prime is 20481817. The reversal of 20481812 is 21818402.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20481817) 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, 15323 + ... + 16605.

It is an arithmetic number, because the mean of its divisors is an integer number (1614844).

Almost surely, 2^20481812 is an apocalyptic number.

It is an amenable number.

20481812 is a deficient number, since it is larger than the sum of its proper divisors (18274444).

20481812 is a wasteful number, since it uses less digits than its factorization.

20481812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607 (or 1605 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 20481812 is about 4525.6835947733. The cubic root of 20481812 is about 273.6042201793.

The spelling of 20481812 in words is "twenty million, four hundred eighty-one thousand, eight hundred twelve".