20389955448 has 128 divisors (see below), whose sum is σ = 56049408000. Its totient is φ = 6152509440.

The previous prime is 20389955437. The next prime is 20389955459. The reversal of 20389955448 is 84455998302.

It is an interprime number because it is at equal distance from previous prime (20389955437) and next prime (20389955459).

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3203293 + ... + 3209651.

It is an arithmetic number, because the mean of its divisors is an integer number (437886000).

Almost surely, 2^20389955448 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 20389955448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28024704000).

20389955448 is an abundant number, since it is smaller than the sum of its proper divisors (35659452552).

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

20389955448 is a wasteful number, since it uses less digits than its factorization.

20389955448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6685 (or 6681 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 57.

The spelling of 20389955448 in words is "twenty billion, three hundred eighty-nine million, nine hundred fifty-five thousand, four hundred forty-eight".