20440430142 has 32 divisors (see below), whose sum is σ = 46536318720. Its totient is φ = 5924761920.

The previous prime is 20440430107. The next prime is 20440430161. The reversal of 20440430142 is 24103404402.

It is a happy number.

It is a super-2 number, since 2×20440430142² (a number of 21 digits) contains 22 as substring.

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, 6731167 + ... + 6734202.

It is an arithmetic number, because the mean of its divisors is an integer number (1454259960).

Almost surely, 2^20440430142 is an apocalyptic number.

20440430142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20440430142 is an abundant number, since it is smaller than the sum of its proper divisors (26095888578).

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

20440430142 is a wasteful number, since it uses less digits than its factorization.

20440430142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13465408.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20440430142 its reverse (24103404402), we get a palindrome (44543834544).

The spelling of 20440430142 in words is "twenty billion, four hundred forty million, four hundred thirty thousand, one hundred forty-two".