20639207424 has 416 divisors, whose sum is σ = 63523367424. Its totient is φ = 5904138240.

The previous prime is 20639207417. The next prime is 20639207453. The reversal of 20639207424 is 42470293602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 308047839 + ... + 308047905.

Almost surely, 2^20639207424 is an apocalyptic number.

20639207424 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 20639207424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31761683712).

20639207424 is an abundant number, since it is smaller than the sum of its proper divisors (42884160000).

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

20639207424 is a wasteful number, since it uses less digits than its factorization.

20639207424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

The spelling of 20639207424 in words is "twenty billion, six hundred thirty-nine million, two hundred seven thousand, four hundred twenty-four".