20911670493184 has 51 divisors (see below), whose sum is σ = 41825363351943. Its totient is φ = 10455249911808.

The previous prime is 20911670493167. The next prime is 20911670493247. The reversal of 20911670493184 is 48139407611902.

The square root of 20911670493184 is 4572928.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1170660637 + ... + 1170678499.

Almost surely, 2^{20911670493184} is an apocalyptic number.

20911670493184 is the 4572928-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20911670493184

20911670493184 is an abundant number, since it is smaller than the sum of its proper divisors (20913692858759).

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

20911670493184 is an frugal number, since it uses more digits than its factorization.

20911670493184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35758 (or 17865 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 20911670493184 in words is "twenty trillion, nine hundred eleven billion, six hundred seventy million, four hundred ninety-three thousand, one hundred eighty-four".