20355266556455 has 16 divisors (see below), whose sum is σ = 24614601447744. Its totient is φ = 16159174041600.

The previous prime is 20355266556409. The next prime is 20355266556461. The reversal of 20355266556455 is 55465566255302.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20355266556455 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20355266556394 and 20355266556403.

It is a congruent number.

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, 29777396 + ... + 30453305.

It is an arithmetic number, because the mean of its divisors is an integer number (1538412590484).

Almost surely, 2^{20355266556455} is an apocalyptic number.

20355266556455 is a deficient number, since it is larger than the sum of its proper divisors (4259334891289).

20355266556455 is a wasteful number, since it uses less digits than its factorization.

20355266556455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60231226.

The product of its (nonzero) digits is 162000000, while the sum is 59.

The spelling of 20355266556455 in words is "twenty trillion, three hundred fifty-five billion, two hundred sixty-six million, five hundred fifty-six thousand, four hundred fifty-five".