20504356404 has 48 divisors (see below), whose sum is σ = 57894657408. Its totient is φ = 5513776128.

The previous prime is 20504356391. The next prime is 20504356409. The reversal of 20504356404 is 40465340502.

It is a super-2 number, since 2×20504356404² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504356409) 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, 7177969 + ... + 7180824.

It is an arithmetic number, because the mean of its divisors is an integer number (1206138696).

Almost surely, 2^20504356404 is an apocalyptic number.

It is an amenable number.

20504356404 is an abundant number, since it is smaller than the sum of its proper divisors (37390301004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20504356404 is a wasteful number, since it uses less digits than its factorization.

20504356404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14358824 (or 14358822 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 20504356404 its reverse (40465340502), we get a palindrome (60969696906).

The spelling of 20504356404 in words is "twenty billion, five hundred four million, three hundred fifty-six thousand, four hundred four".