20421111320 has 32 divisors (see below), whose sum is σ = 46529121600. Its totient is φ = 8065045248.

The previous prime is 20421111317. The next prime is 20421111341. The reversal of 20421111320 is 2311112402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3228029 + ... + 3234348.

It is an arithmetic number, because the mean of its divisors is an integer number (1454035050).

Almost surely, 2^20421111320 is an apocalyptic number.

20421111320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421111320 is an abundant number, since it is smaller than the sum of its proper divisors (26108010280).

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

20421111320 is a wasteful number, since it uses less digits than its factorization.

20421111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462467 (or 6462463 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20421111320 its reverse (2311112402), we get a palindrome (22732223722).

The spelling of 20421111320 in words is "twenty billion, four hundred twenty-one million, one hundred eleven thousand, three hundred twenty".