20012021320 has 32 divisors (see below), whose sum is σ = 47396894400. Its totient is φ = 7583502528.

The previous prime is 20012021299. The next prime is 20012021347. The reversal of 20012021320 is 2312021002.

It is a self number, because there is not a number n which added to its sum of digits gives 20012021320.

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, 13165044 + ... + 13166563.

It is an arithmetic number, because the mean of its divisors is an integer number (1481152950).

Almost surely, 2^20012021320 is an apocalyptic number.

20012021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012021320 is an abundant number, since it is smaller than the sum of its proper divisors (27384873080).

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

20012021320 is a wasteful number, since it uses less digits than its factorization.

20012021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26331637 (or 26331633 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20012021320 its reverse (2312021002), we get a palindrome (22324042322).

The spelling of 20012021320 in words is "twenty billion, twelve million, twenty-one thousand, three hundred twenty".