20154145243 has 4 divisors (see below), whose sum is σ = 20156601448. Its totient is φ = 20151689040.

The previous prime is 20154145229. The next prime is 20154145267. The reversal of 20154145243 is 34254145102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34254145102 = 2 ⋅17127072551.

It is a cyclic number.

It is not a de Polignac number, because 20154145243 - 2¹³ = 20154137051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20154148243) 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, 1215753 + ... + 1232218.

It is an arithmetic number, because the mean of its divisors is an integer number (5039150362).

Almost surely, 2^20154145243 is an apocalyptic number.

20154145243 is a deficient number, since it is larger than the sum of its proper divisors (2456205).

20154145243 is an equidigital number, since it uses as much as digits as its factorization.

20154145243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456204.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 20154145243 in words is "twenty billion, one hundred fifty-four million, one hundred forty-five thousand, two hundred forty-three".