20400048 has 30 divisors (see below), whose sum is σ = 57092204. Its totient is φ = 6799968.

The previous prime is 20400031. The next prime is 20400049. The reversal of 20400048 is 84000402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 20400048.

It is not an unprimeable number, because it can be changed into a prime (20400049) 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 5 ways as a sum of consecutive naturals, for example, 70690 + ... + 70977.

Almost surely, 2^20400048 is an apocalyptic number.

It is an amenable number.

20400048 is an abundant number, since it is smaller than the sum of its proper divisors (36692156).

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

20400048 is a wasteful number, since it uses less digits than its factorization.

20400048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141681 (or 141672 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 20400048 is about 4516.6412299407. The cubic root of 20400048 is about 273.2396559147.

The spelling of 20400048 in words is "twenty million, four hundred thousand, forty-eight".