20355340404 has 96 divisors (see below), whose sum is σ = 56123662336. Its totient is φ = 5618989440.

The previous prime is 20355340351. The next prime is 20355340463. The reversal of 20355340404 is 40404355302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1668294 + ... + 1680450.

Almost surely, 2^20355340404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20355340404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28061831168).

20355340404 is an abundant number, since it is smaller than the sum of its proper divisors (35768321932).

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

20355340404 is a wasteful number, since it uses less digits than its factorization.

20355340404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12845 (or 12843 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 30.

Adding to 20355340404 its reverse (40404355302), we get a palindrome (60759695706).

The spelling of 20355340404 in words is "twenty billion, three hundred fifty-five million, three hundred forty thousand, four hundred four".