20400242420404 has 48 divisors (see below), whose sum is σ = 44552459427840. Its totient is φ = 7940496468960.

The previous prime is 20400242420381. The next prime is 20400242420461. The reversal of 20400242420404 is 40402424200402.

It is a super-2 number, since 2×20400242420404² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31554172 + ... + 32194195.

It is an arithmetic number, because the mean of its divisors is an integer number (928176238080).

Almost surely, 2^{20400242420404} is an apocalyptic number.

It is an amenable number.

20400242420404 is an abundant number, since it is smaller than the sum of its proper divisors (24152217007436).

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

20400242420404 is a wasteful number, since it uses less digits than its factorization.

20400242420404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63749428 (or 63749426 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 20400242420404 its reverse (40402424200402), we get a palindrome (60802666620806).

The spelling of 20400242420404 in words is "twenty trillion, four hundred billion, two hundred forty-two million, four hundred twenty thousand, four hundred four".