20538641941 has 4 divisors (see below), whose sum is σ = 20541915072. Its totient is φ = 20535368812.

The previous prime is 20538641939. The next prime is 20538642011. The reversal of 20538641941 is 14914683502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14914683502 = 2 ⋅7457341751.

It is a cyclic number.

It is not a de Polignac number, because 20538641941 - 2¹ = 20538641939 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20538648941) 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, 1627135 + ... + 1639708.

It is an arithmetic number, because the mean of its divisors is an integer number (5135478768).

Almost surely, 2^20538641941 is an apocalyptic number.

It is an amenable number.

20538641941 is a deficient number, since it is larger than the sum of its proper divisors (3273131).

20538641941 is an equidigital number, since it uses as much as digits as its factorization.

20538641941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273130.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 20538641941 in words is "twenty billion, five hundred thirty-eight million, six hundred forty-one thousand, nine hundred forty-one".