20155212142 has 8 divisors (see below), whose sum is σ = 32558419656. Its totient is φ = 9302405592.

The previous prime is 20155212139. The next prime is 20155212149. The reversal of 20155212142 is 24121255102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155212149) 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, 387600208 + ... + 387600259.

It is an arithmetic number, because the mean of its divisors is an integer number (4069802457).

Almost surely, 2^20155212142 is an apocalyptic number.

20155212142 is a deficient number, since it is larger than the sum of its proper divisors (12403207514).

20155212142 is a wasteful number, since it uses less digits than its factorization.

20155212142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775200482.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 20155212142 its reverse (24121255102), we get a palindrome (44276467244).

The spelling of 20155212142 in words is "twenty billion, one hundred fifty-five million, two hundred twelve thousand, one hundred forty-two".