20905330072 has 24 divisors (see below), whose sum is σ = 42763676940. Its totient is φ = 9501806240.

The previous prime is 20905330057. The next prime is 20905330087. The reversal of 20905330072 is 27003350902.

It is an interprime number because it is at equal distance from previous prime (20905330057) and next prime (20905330087).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1348638 + ... + 1364050.

Almost surely, 2^20905330072 is an apocalyptic number.

20905330072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20905330072 is an abundant number, since it is smaller than the sum of its proper divisors (21858346868).

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

20905330072 is an frugal number, since it uses more digits than its factorization.

20905330072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30843 (or 15426 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 31.

Adding to 20905330072 its reverse (27003350902), we get a palindrome (47908680974).

The spelling of 20905330072 in words is "twenty billion, nine hundred five million, three hundred thirty thousand, seventy-two".