20403324021 has 16 divisors (see below), whose sum is σ = 28811939840. Its totient is φ = 12807246960.

The previous prime is 20403323987. The next prime is 20403324037. The reversal of 20403324021 is 12042330402.

It is not a de Polignac number, because 20403324021 - 2⁹ = 20403323509 is a prime.

It is a super-2 number, since 2×20403324021² (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 (20403344021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1088725 + ... + 1107306.

It is an arithmetic number, because the mean of its divisors is an integer number (1800746240).

Almost surely, 2^20403324021 is an apocalyptic number.

It is an amenable number.

20403324021 is a deficient number, since it is larger than the sum of its proper divisors (8408615819).

20403324021 is a wasteful number, since it uses less digits than its factorization.

20403324021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196216.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20403324021 its reverse (12042330402), we get a palindrome (32445654423).

The spelling of 20403324021 in words is "twenty billion, four hundred three million, three hundred twenty-four thousand, twenty-one".