20541423 has 32 divisors (see below), whose sum is σ = 33440256. Its totient is φ = 10948608.

The previous prime is 20541419. The next prime is 20541431. The reversal of 20541423 is 32414502.

It is not a de Polignac number, because 20541423 - 2² = 20541419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20541423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58015 + ... + 58367.

It is an arithmetic number, because the mean of its divisors is an integer number (1045008).

Almost surely, 2^20541423 is an apocalyptic number.

20541423 is a deficient number, since it is larger than the sum of its proper divisors (12898833).

20541423 is a wasteful number, since it uses less digits than its factorization.

20541423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20541423 is about 4532.2646657052. The cubic root of 20541423 is about 273.8693989276.

Adding to 20541423 its reverse (32414502), we get a palindrome (52955925).

The spelling of 20541423 in words is "twenty million, five hundred forty-one thousand, four hundred twenty-three".