20004031421 has 16 divisors (see below), whose sum is σ = 23071502400. Its totient is φ = 17153078400.

The previous prime is 20004031387. The next prime is 20004031433. The reversal of 20004031421 is 12413040002.

It is a de Polignac number, because none of the positive numbers 2^k-20004031421 is a prime.

It is a super-2 number, since 2×20004031421² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20004031421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004021421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161120 + ... + 256841.

It is an arithmetic number, because the mean of its divisors is an integer number (1441968900).

Almost surely, 2^20004031421 is an apocalyptic number.

It is an amenable number.

20004031421 is a deficient number, since it is larger than the sum of its proper divisors (3067470979).

20004031421 is a wasteful number, since it uses less digits than its factorization.

20004031421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418220.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20004031421 its reverse (12413040002), we get a palindrome (32417071423).

The spelling of 20004031421 in words is "twenty billion, four million, thirty-one thousand, four hundred twenty-one".