20402748 has 72 divisors (see below), whose sum is σ = 55220256. Its totient is φ = 6336000.

The previous prime is 20402741. The next prime is 20402761. The reversal of 20402748 is 84720402.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402741) 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 23 ways as a sum of consecutive naturals, for example, 33648 + ... + 34248.

It is an arithmetic number, because the mean of its divisors is an integer number (766948).

Almost surely, 2^20402748 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20402748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27610128).

20402748 is an abundant number, since it is smaller than the sum of its proper divisors (34817508).

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

20402748 is a wasteful number, since it uses less digits than its factorization.

20402748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20402748 is about 4516.9401147237. The cubic root of 20402748 is about 273.2517100453.

The spelling of 20402748 in words is "twenty million, four hundred two thousand, seven hundred forty-eight".