20654128345 has 16 divisors (see below), whose sum is σ = 25803530640. Its totient is φ = 15856487424.

The previous prime is 20654128301. The next prime is 20654128349. The reversal of 20654128345 is 54382145602.

It can be written as a sum of positive squares in 8 ways, for example, as 36614601 + 20617513744 = 6051^2 + 143588^2 .

It is a cyclic number.

It is not a de Polignac number, because 20654128345 - 2⁷ = 20654128217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20654128298 and 20654128307.

It is not an unprimeable number, because it can be changed into a prime (20654128349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 751180 + ... + 778189.

It is an arithmetic number, because the mean of its divisors is an integer number (1612720665).

Almost surely, 2^20654128345 is an apocalyptic number.

It is an amenable number.

20654128345 is a deficient number, since it is larger than the sum of its proper divisors (5149402295).

20654128345 is a wasteful number, since it uses less digits than its factorization.

20654128345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529484.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 20654128345 in words is "twenty billion, six hundred fifty-four million, one hundred twenty-eight thousand, three hundred forty-five".