20102105155 has 32 divisors (see below), whose sum is σ = 27742445568. Its totient is φ = 13847030400.

The previous prime is 20102105117. The next prime is 20102105197. The reversal of 20102105155 is 55150120102.

It is a happy number.

It is not a de Polignac number, because 20102105155 - 2¹⁵ = 20102072387 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45292 + ... + 205561.

It is an arithmetic number, because the mean of its divisors is an integer number (866951424).

Almost surely, 2^20102105155 is an apocalyptic number.

20102105155 is a deficient number, since it is larger than the sum of its proper divisors (7640340413).

20102105155 is a wasteful number, since it uses less digits than its factorization.

20102105155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250947.

The product of its (nonzero) digits is 500, while the sum is 22.

Adding to 20102105155 its reverse (55150120102), we get a palindrome (75252225257).

The spelling of 20102105155 in words is "twenty billion, one hundred two million, one hundred five thousand, one hundred fifty-five".