20511604346245 has 8 divisors (see below), whose sum is σ = 24623688786840. Its totient is φ = 16402774429440.

The previous prime is 20511604346239. The next prime is 20511604346269. The reversal of 20511604346245 is 54264340611502.

It can be written as a sum of positive squares in 4 ways, for example, as 2324774127841 + 18186830218404 = 1524721^2 + 4264602^2 .

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

It is not a de Polignac number, because 20511604346245 - 2⁵ = 20511604346213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813617080 + ... + 813642289.

It is an arithmetic number, because the mean of its divisors is an integer number (3077961098355).

Almost surely, 2^{20511604346245} is an apocalyptic number.

It is an amenable number.

20511604346245 is a deficient number, since it is larger than the sum of its proper divisors (4112084440595).

20511604346245 is a wasteful number, since it uses less digits than its factorization.

20511604346245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627261895.

The product of its (nonzero) digits is 691200, while the sum is 43.

Adding to 20511604346245 its reverse (54264340611502), we get a palindrome (74775944957747).

The spelling of 20511604346245 in words is "twenty trillion, five hundred eleven billion, six hundred four million, three hundred forty-six thousand, two hundred forty-five".