20648949133 has 8 divisors (see below), whose sum is σ = 20818967960. Its totient is φ = 20479417920.

The previous prime is 20648949109. The next prime is 20648949161. The reversal of 20648949133 is 33194984602.

It can be written as a sum of positive squares in 4 ways, for example, as 143568324 + 20505380809 = 11982^2 + 143197^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20648949133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648949193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36618 + ... + 206491.

It is an arithmetic number, because the mean of its divisors is an integer number (2602370995).

Almost surely, 2^20648949133 is an apocalyptic number.

It is an amenable number.

20648949133 is a deficient number, since it is larger than the sum of its proper divisors (170018827).

20648949133 is a wasteful number, since it uses less digits than its factorization.

20648949133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243807.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 20648949133 in words is "twenty billion, six hundred forty-eight million, nine hundred forty-nine thousand, one hundred thirty-three".