20420424042004 has 36 divisors (see below), whose sum is σ = 41834927024436. Its totient is φ = 8695867549824.

The previous prime is 20420424041971. The next prime is 20420424042077. The reversal of 20420424042004 is 40024042402402.

It can be written as a sum of positive squares in 2 ways, for example, as 10998164057104 + 9422259984900 = 3316348^2 + 3069570^2 .

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 11 ways as a sum of consecutive naturals, for example, 331771257 + ... + 331832800.

Almost surely, 2^{20420424042004} is an apocalyptic number.

It is an amenable number.

20420424042004 is an abundant number, since it is smaller than the sum of its proper divisors (21414502982432).

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

20420424042004 is a wasteful number, since it uses less digits than its factorization.

20420424042004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663604232 (or 663604223 counting only the distinct ones).

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

Adding to 20420424042004 its reverse (40024042402402), we get a palindrome (60444466444406).

The spelling of 20420424042004 in words is "twenty trillion, four hundred twenty billion, four hundred twenty-four million, forty-two thousand, four".