20153543 has 8 divisors (see below), whose sum is σ = 21119616. Its totient is φ = 19195000.

The previous prime is 20153531. The next prime is 20153561. The reversal of 20153543 is 34535102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20153543 - 2¹² = 20149447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20153513) 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, 4028 + ... + 7518.

It is an arithmetic number, because the mean of its divisors is an integer number (2639952).

Almost surely, 2^20153543 is an apocalyptic number.

20153543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20153543 is a deficient number, since it is larger than the sum of its proper divisors (966073).

20153543 is a wasteful number, since it uses less digits than its factorization.

20153543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3765.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20153543 is about 4489.2697624447. The cubic root of 20153543 is about 272.1346246420.

Adding to 20153543 its reverse (34535102), we get a palindrome (54688645).

The spelling of 20153543 in words is "twenty million, one hundred fifty-three thousand, five hundred forty-three".