20154423539 has 2 divisors, whose sum is σ = 20154423540. Its totient is φ = 20154423538.

The previous prime is 20154423529. The next prime is 20154423571. The reversal of 20154423539 is 93532445102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20154423539 - 2⁸ = 20154423283 is a prime.

It is not a weakly prime, because it can be changed into another prime (20154423529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077211769 + 10077211770.

It is an arithmetic number, because the mean of its divisors is an integer number (10077211770).

Almost surely, 2^20154423539 is an apocalyptic number.

20154423539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20154423539 is an equidigital number, since it uses as much as digits as its factorization.

20154423539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 20154423539 in words is "twenty billion, one hundred fifty-four million, four hundred twenty-three thousand, five hundred thirty-nine".