20525215424 has 112 divisors (see below), whose sum is σ = 50323211520. Its totient is φ = 8108190720.

The previous prime is 20525215393. The next prime is 20525215427. The reversal of 20525215424 is 42451252502.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (20525215427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282359 + ... + 347529.

Almost surely, 2^20525215424 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 20525215424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25161605760).

20525215424 is an abundant number, since it is smaller than the sum of its proper divisors (29797996096).

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

20525215424 is a wasteful number, since it uses less digits than its factorization.

20525215424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65246 (or 65236 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 32.

Adding to 20525215424 its reverse (42451252502), we get a palindrome (62976467926).

The spelling of 20525215424 in words is "twenty billion, five hundred twenty-five million, two hundred fifteen thousand, four hundred twenty-four".