20102340144 has 20 divisors (see below), whose sum is σ = 51931045496. Its totient is φ = 6700780032.

The previous prime is 20102340143. The next prime is 20102340187. The reversal of 20102340144 is 44104320102.

It is a self number, because there is not a number n which added to its sum of digits gives 20102340144.

It is not an unprimeable number, because it can be changed into a prime (20102340143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209399329 + ... + 209399424.

Almost surely, 2^20102340144 is an apocalyptic number.

20102340144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20102340144 is an abundant number, since it is smaller than the sum of its proper divisors (31828705352).

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

20102340144 is a wasteful number, since it uses less digits than its factorization.

20102340144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418798764 (or 418798758 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20102340144 its reverse (44104320102), we get a palindrome (64206660246).

The spelling of 20102340144 in words is "twenty billion, one hundred two million, three hundred forty thousand, one hundred forty-four".