20420215512 has 32 divisors (see below), whose sum is σ = 51812491200. Its totient is φ = 6705144864.

The previous prime is 20420215507. The next prime is 20420215513. The reversal of 20420215512 is 21551202402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420215513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6347962 + ... + 6351177.

It is an arithmetic number, because the mean of its divisors is an integer number (1619140350).

Almost surely, 2^20420215512 is an apocalyptic number.

It is an amenable number.

20420215512 is an abundant number, since it is smaller than the sum of its proper divisors (31392275688).

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

20420215512 is a wasteful number, since it uses less digits than its factorization.

20420215512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12699215 (or 12699211 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 20420215512 its reverse (21551202402), we get a palindrome (41971417914).

The spelling of 20420215512 in words is "twenty billion, four hundred twenty million, two hundred fifteen thousand, five hundred twelve".