20529438720 has 448 divisors, whose sum is σ = 77757649920. Its totient is φ = 4525129728.

The previous prime is 20529438679. The next prime is 20529438773. The reversal of 20529438720 is 2783492502.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24944229 + ... + 24945051.

Almost surely, 2^20529438720 is an apocalyptic number.

20529438720 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 20529438720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38878824960).

20529438720 is an abundant number, since it is smaller than the sum of its proper divisors (57228211200).

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

20529438720 is an equidigital number, since it uses as much as digits as its factorization.

20529438720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 869 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 20529438720 in words is "twenty billion, five hundred twenty-nine million, four hundred thirty-eight thousand, seven hundred twenty".