20928489624 has 192 divisors, whose sum is σ = 67238683200. Its totient is φ = 5753889792.

The previous prime is 20928489601. The next prime is 20928489661. The reversal of 20928489624 is 42698482902.

20928489624 is a `hidden beast` number, since 2 + 0 + 9 + 2 + 8 + 4 + 8 + 9 + 624 = 666.

It is a super-2 number, since 2×20928489624² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4631014 + ... + 4635530.

It is an arithmetic number, because the mean of its divisors is an integer number (350201475).

Almost surely, 2^20928489624 is an apocalyptic number.

20928489624 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 20928489624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33619341600).

20928489624 is an abundant number, since it is smaller than the sum of its proper divisors (46310193576).

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

20928489624 is a wasteful number, since it uses less digits than its factorization.

20928489624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4882 (or 4875 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 20928489624 in words is "twenty billion, nine hundred twenty-eight million, four hundred eighty-nine thousand, six hundred twenty-four".