20154223544 has 32 divisors (see below), whose sum is σ = 46509748320. Its totient is φ = 7973099136.

The previous prime is 20154223543. The next prime is 20154223567. The reversal of 20154223544 is 44532245102.

It is a self number, because there is not a number n which added to its sum of digits gives 20154223544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20154223541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13841459 + ... + 13842914.

It is an arithmetic number, because the mean of its divisors is an integer number (1453429635).

Almost surely, 2^20154223544 is an apocalyptic number.

It is an amenable number.

20154223544 is an abundant number, since it is smaller than the sum of its proper divisors (26355524776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20154223544 is a wasteful number, since it uses less digits than its factorization.

20154223544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27684399 (or 27684395 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 20154223544 its reverse (44532245102), we get a palindrome (64686468646).

The spelling of 20154223544 in words is "twenty billion, one hundred fifty-four million, two hundred twenty-three thousand, five hundred forty-four".