20554243641 has 32 divisors (see below), whose sum is σ = 31785765120. Its totient is φ = 13102480512.

The previous prime is 20554243639. The next prime is 20554243673. The reversal of 20554243641 is 14634245502.

20554243641 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 4 + 2 + 4 + 3 + 641 = 666.

It is not a de Polignac number, because 20554243641 - 2¹ = 20554243639 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20554243596 and 20554243605.

It is not an unprimeable number, because it can be changed into a prime (20554243691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3271395 + ... + 3277671.

It is an arithmetic number, because the mean of its divisors is an integer number (993305160).

Almost surely, 2^20554243641 is an apocalyptic number.

It is an amenable number.

20554243641 is a deficient number, since it is larger than the sum of its proper divisors (11231521479).

20554243641 is a wasteful number, since it uses less digits than its factorization.

20554243641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11582 (or 11576 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 20554243641 in words is "twenty billion, five hundred fifty-four million, two hundred forty-three thousand, six hundred forty-one".