20500115004 has 72 divisors (see below), whose sum is σ = 54184865280. Its totient is φ = 6522718752.

The previous prime is 20500114991. The next prime is 20500115021. The reversal of 20500115004 is 40051100502.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377817 + ... + 428655.

Almost surely, 2^20500115004 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 20500115004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27092432640).

20500115004 is an abundant number, since it is smaller than the sum of its proper divisors (33684750276).

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

20500115004 is a wasteful number, since it uses less digits than its factorization.

20500115004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51359 (or 51354 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

Adding to 20500115004 its reverse (40051100502), we get a palindrome (60551215506).

The spelling of 20500115004 in words is "twenty billion, five hundred million, one hundred fifteen thousand, four".