20472721919 has 8 divisors (see below), whose sum is σ = 22084734672. Its totient is φ = 18866021760.

The previous prime is 20472721897. The next prime is 20472721943. The reversal of 20472721919 is 91912727402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20472721919 - 2⁸ = 20472721663 is a prime.

It is a super-2 number, since 2×20472721919² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20472721919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472721979) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1320137 + ... + 1335554.

It is an arithmetic number, because the mean of its divisors is an integer number (2760591834).

Almost surely, 2^20472721919 is an apocalyptic number.

20472721919 is a deficient number, since it is larger than the sum of its proper divisors (1612012753).

20472721919 is a wasteful number, since it uses less digits than its factorization.

20472721919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656297.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 20472721919 in words is "twenty billion, four hundred seventy-two million, seven hundred twenty-one thousand, nine hundred nineteen".