20154256043 has 4 divisors (see below), whose sum is σ = 20209172640. Its totient is φ = 20099339448.

The previous prime is 20154256033. The next prime is 20154256079. The reversal of 20154256043 is 34065245102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20154256043 - 2²⁰ = 20153207467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20154256033) 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, 27457748 + ... + 27458481.

It is an arithmetic number, because the mean of its divisors is an integer number (5052293160).

Almost surely, 2^20154256043 is an apocalyptic number.

20154256043 is a deficient number, since it is larger than the sum of its proper divisors (54916597).

20154256043 is an equidigital number, since it uses as much as digits as its factorization.

20154256043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54916596.

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 20154256043 in words is "twenty billion, one hundred fifty-four million, two hundred fifty-six thousand, forty-three".