20365256541 has 16 divisors (see below), whose sum is σ = 31457880704. Its totient is φ = 11477873664.

The previous prime is 20365256521. The next prime is 20365256567. The reversal of 20365256541 is 14565256302.

It is not a de Polignac number, because 20365256541 - 2¹⁰ = 20365255517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20365256541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20365256521) 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, 6640756 + ... + 6643821.

It is an arithmetic number, because the mean of its divisors is an integer number (1966117544).

Almost surely, 2^20365256541 is an apocalyptic number.

20365256541 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20365256541 is a deficient number, since it is larger than the sum of its proper divisors (11092624163).

20365256541 is a wasteful number, since it uses less digits than its factorization.

20365256541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13284660.

The product of its (nonzero) digits is 216000, while the sum is 39.

The spelling of 20365256541 in words is "twenty billion, three hundred sixty-five million, two hundred fifty-six thousand, five hundred forty-one".