20425979440 has 80 divisors (see below), whose sum is σ = 48378028608. Its totient is φ = 8019099648.

The previous prime is 20425979407. The next prime is 20425979473. The reversal of 20425979440 is 4497952402.

It is an interprime number because it is at equal distance from previous prime (20425979407) and next prime (20425979473).

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 920152 + ... + 942088.

Almost surely, 2^20425979440 is an apocalyptic number.

20425979440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20425979440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24189014304).

20425979440 is an abundant number, since it is smaller than the sum of its proper divisors (27952049168).

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

20425979440 is a wasteful number, since it uses less digits than its factorization.

20425979440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22166 (or 22160 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 20425979440 in words is "twenty billion, four hundred twenty-five million, nine hundred seventy-nine thousand, four hundred forty".