20748148548251 has 4 divisors (see below), whose sum is σ = 21840156366600. Its totient is φ = 19656140729904.

The previous prime is 20748148548233. The next prime is 20748148548287. The reversal of 20748148548251 is 15284584184702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20748148548251 - 2¹⁰ = 20748148547227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20748148545251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546003909146 + ... + 546003909183.

It is an arithmetic number, because the mean of its divisors is an integer number (5460039091650).

Almost surely, 2^{20748148548251} is an apocalyptic number.

20748148548251 is a deficient number, since it is larger than the sum of its proper divisors (1092007818349).

20748148548251 is a wasteful number, since it uses less digits than its factorization.

20748148548251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092007818348.

The product of its (nonzero) digits is 22937600, while the sum is 59.

The spelling of 20748148548251 in words is "twenty trillion, seven hundred forty-eight billion, one hundred forty-eight million, five hundred forty-eight thousand, two hundred fifty-one".