20523640200355 has 16 divisors (see below), whose sum is σ = 24996164741280. Its totient is φ = 16173718589952.

The previous prime is 20523640200347. The next prime is 20523640200499. The reversal of 20523640200355 is 55300204632502.

It is a cyclic number.

It is not a de Polignac number, because 20523640200355 - 2³ = 20523640200347 is a prime.

It is a super-3 number, since 3×20523640200355³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63682561 + ... + 64004029.

It is an arithmetic number, because the mean of its divisors is an integer number (1562260296330).

Almost surely, 2^{20523640200355} is an apocalyptic number.

20523640200355 is a deficient number, since it is larger than the sum of its proper divisors (4472524540925).

20523640200355 is a wasteful number, since it uses less digits than its factorization.

20523640200355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512118.

The product of its (nonzero) digits is 216000, while the sum is 37.

Adding to 20523640200355 its reverse (55300204632502), we get a palindrome (75823844832857).

The spelling of 20523640200355 in words is "twenty trillion, five hundred twenty-three billion, six hundred forty million, two hundred thousand, three hundred fifty-five".