20420880284 has 48 divisors (see below), whose sum is σ = 44060200128. Its totient is φ = 8081568768.

The previous prime is 20420880281. The next prime is 20420880317. The reversal of 20420880284 is 48208802402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420880281) 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, 379499 + ... + 429954.

It is an arithmetic number, because the mean of its divisors is an integer number (917920836).

Almost surely, 2^20420880284 is an apocalyptic number.

It is an amenable number.

20420880284 is an abundant number, since it is smaller than the sum of its proper divisors (23639319844).

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

20420880284 is a wasteful number, since it uses less digits than its factorization.

20420880284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809534 (or 809532 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 38.

The spelling of 20420880284 in words is "twenty billion, four hundred twenty million, eight hundred eighty thousand, two hundred eighty-four".