20425540608 has 440 divisors, whose sum is σ = 67814719104. Its totient is φ = 6071500800.

The previous prime is 20425540601. The next prime is 20425540649. The reversal of 20425540608 is 80604552402.

It is a happy number.

20425540608 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 5 + 5 + 40 + 608 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425540601) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 55655241 + ... + 55655607.

Almost surely, 2^20425540608 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 20425540608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33907359552).

20425540608 is an abundant number, since it is smaller than the sum of its proper divisors (47389178496).

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

20425540608 is a wasteful number, since it uses less digits than its factorization.

20425540608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The spelling of 20425540608 in words is "twenty billion, four hundred twenty-five million, five hundred forty thousand, six hundred eight".