20425534464 has 176 divisors, whose sum is σ = 56722795776. Its totient is φ = 6528614400.

The previous prime is 20425534463. The next prime is 20425534469. The reversal of 20425534464 is 46443552402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20425534463) 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 15 ways as a sum of consecutive naturals, for example, 8068879 + ... + 8071409.

Almost surely, 2^20425534464 is an apocalyptic number.

20425534464 is a gapful number since it is divisible by the number (24) 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 20425534464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28361397888).

20425534464 is an abundant number, since it is smaller than the sum of its proper divisors (36297261312).

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

20425534464 is a wasteful number, since it uses less digits than its factorization.

20425534464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662 (or 2644 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 39.

The spelling of 20425534464 in words is "twenty billion, four hundred twenty-five million, five hundred thirty-four thousand, four hundred sixty-four".