20115100155 has 32 divisors (see below), whose sum is σ = 32279075136. Its totient is φ = 10696472064.

The previous prime is 20115100121. The next prime is 20115100183. The reversal of 20115100155 is 55100151102.

It is not a de Polignac number, because 20115100155 - 2⁸ = 20115099899 is a prime.

It is a super-3 number, since 3×20115100155³ (a number of 32 digits) contains 333 as substring.

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, 11880489 + ... + 11882181.

It is an arithmetic number, because the mean of its divisors is an integer number (1008721098).

Almost surely, 2^20115100155 is an apocalyptic number.

20115100155 is a deficient number, since it is larger than the sum of its proper divisors (12163974981).

20115100155 is a wasteful number, since it uses less digits than its factorization.

20115100155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3567.

The product of its (nonzero) digits is 250, while the sum is 21.

Adding to 20115100155 its reverse (55100151102), we get a palindrome (75215251257).

The spelling of 20115100155 in words is "twenty billion, one hundred fifteen million, one hundred thousand, one hundred fifty-five".