20355336201656 has 16 divisors (see below), whose sum is σ = 38314762212240. Its totient is φ = 10138066278400.

The previous prime is 20355336201611. The next prime is 20355336201659. The reversal of 20355336201656 is 65610263355302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20355336201656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355336201659) 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, 4950225620 + ... + 4950229731.

It is an arithmetic number, because the mean of its divisors is an integer number (2394672638265).

Almost surely, 2^{20355336201656} is an apocalyptic number.

It is an amenable number.

20355336201656 is a deficient number, since it is larger than the sum of its proper divisors (17959426010584).

20355336201656 is a wasteful number, since it uses less digits than its factorization.

20355336201656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9900455614 (or 9900455610 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 47.

Adding to 20355336201656 its reverse (65610263355302), we get a palindrome (85965599556958).

The spelling of 20355336201656 in words is "twenty trillion, three hundred fifty-five billion, three hundred thirty-six million, two hundred one thousand, six hundred fifty-six".