20420244042 has 32 divisors (see below), whose sum is σ = 47174042304. Its totient is φ = 5823955200.

The previous prime is 20420244011. The next prime is 20420244043. The reversal of 20420244042 is 24044202402.

It is not an unprimeable number, because it can be changed into a prime (20420244043) 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, 9098809 + ... + 9101052.

It is an arithmetic number, because the mean of its divisors is an integer number (1474188822).

Almost surely, 2^20420244042 is an apocalyptic number.

20420244042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20420244042 is an abundant number, since it is smaller than the sum of its proper divisors (26753798262).

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

20420244042 is a wasteful number, since it uses less digits than its factorization.

20420244042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18199894.

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 20420244042 its reverse (24044202402), we get a palindrome (44464446444).

It can be divided in two parts, 20420 and 244042, that added together give a palindrome (264462).

The spelling of 20420244042 in words is "twenty billion, four hundred twenty million, two hundred forty-four thousand, forty-two".