20155102102 has 8 divisors (see below), whose sum is σ = 30340243512. Its totient is φ = 10041687600.

The previous prime is 20155102091. The next prime is 20155102103. The reversal of 20155102102 is 20120155102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20155102102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155102103) 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, 17931024 + ... + 17932147.

It is an arithmetic number, because the mean of its divisors is an integer number (3792530439).

Almost surely, 2^20155102102 is an apocalyptic number.

20155102102 is a deficient number, since it is larger than the sum of its proper divisors (10185141410).

20155102102 is a wasteful number, since it uses less digits than its factorization.

20155102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35863454.

The product of its (nonzero) digits is 200, while the sum is 19.

Adding to 20155102102 its reverse (20120155102), we get a palindrome (40275257204).

The spelling of 20155102102 in words is "twenty billion, one hundred fifty-five million, one hundred two thousand, one hundred two".