20953421317780 has 72 divisors (see below), whose sum is σ = 51297249043656. Its totient is φ = 7168446432000.

The previous prime is 20953421317721. The next prime is 20953421317799. The reversal of 20953421317780 is 8771312435902.

It can be written as a sum of positive squares in 4 ways, for example, as 1291486782096 + 19661934535684 = 1136436^2 + 4434178^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22738071 + ... + 23641630.

It is an arithmetic number, because the mean of its divisors is an integer number (712461792273).

Almost surely, 2^{20953421317780} is an apocalyptic number.

20953421317780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20953421317780 is an abundant number, since it is smaller than the sum of its proper divisors (30343827725876).

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

20953421317780 is a wasteful number, since it uses less digits than its factorization.

20953421317780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46380185 (or 46380176 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 20953421317780 in words is "twenty trillion, nine hundred fifty-three billion, four hundred twenty-one million, three hundred seventeen thousand, seven hundred eighty".