20154444151 has 4 divisors (see below), whose sum is σ = 20155138632. Its totient is φ = 20153749672.

The previous prime is 20154444053. The next prime is 20154444203. The reversal of 20154444151 is 15144445102.

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 20154444151 - 2¹¹ = 20154442103 is a prime.

It is a super-2 number, since 2×20154444151² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20154444851) 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, 301720 + ... + 362413.

It is an arithmetic number, because the mean of its divisors is an integer number (5038784658).

Almost surely, 2^20154444151 is an apocalyptic number.

20154444151 is a deficient number, since it is larger than the sum of its proper divisors (694481).

20154444151 is an equidigital number, since it uses as much as digits as its factorization.

20154444151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694480.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 20154444151 its reverse (15144445102), we get a palindrome (35298889253).

The spelling of 20154444151 in words is "twenty billion, one hundred fifty-four million, four hundred forty-four thousand, one hundred fifty-one".