20148804557 has 12 divisors (see below), whose sum is σ = 23459452380. Its totient is φ = 17254895616.

The previous prime is 20148804551. The next prime is 20148804569. The reversal of 20148804557 is 75540884102.

It can be written as a sum of positive squares in 2 ways, for example, as 913611076 + 19235193481 = 30226^2 + 138691^2 .

It is not a de Polignac number, because 20148804557 - 2¹⁰ = 20148803533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20148804551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129332 + ... + 238797.

It is an arithmetic number, because the mean of its divisors is an integer number (1954954365).

Almost surely, 2^20148804557 is an apocalyptic number.

It is an amenable number.

20148804557 is a deficient number, since it is larger than the sum of its proper divisors (3310647823).

20148804557 is a wasteful number, since it uses less digits than its factorization.

20148804557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369260 (or 369253 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 44.

The spelling of 20148804557 in words is "twenty billion, one hundred forty-eight million, eight hundred four thousand, five hundred fifty-seven".