20543003421 has 8 divisors (see below), whose sum is σ = 27392316480. Its totient is φ = 13694512992.

The previous prime is 20543003419. The next prime is 20543003443. The reversal of 20543003421 is 12430034502.

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

It is not a de Polignac number, because 20543003421 - 2¹ = 20543003419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20543003391 and 20543003400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543002421) 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, 144816 + ... + 249113.

It is an arithmetic number, because the mean of its divisors is an integer number (3424039560).

Almost surely, 2^20543003421 is an apocalyptic number.

It is an amenable number.

20543003421 is a deficient number, since it is larger than the sum of its proper divisors (6849313059).

20543003421 is a wasteful number, since it uses less digits than its factorization.

20543003421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411315.

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 20543003421 its reverse (12430034502), we get a palindrome (32973037923).

The spelling of 20543003421 in words is "twenty billion, five hundred forty-three million, three thousand, four hundred twenty-one".