105020139 has 32 divisors (see below), whose sum is σ = 168689664. Its totient is φ = 56818080.

The previous prime is 105020131. The next prime is 105020143. The reversal of 105020139 is 931020501.

It is not a de Polignac number, because 105020139 - 2³ = 105020131 is a prime.

It is a super-2 number, since 2×105020139² = 22058459191158642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (105020131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48694 + ... + 50804.

It is an arithmetic number, because the mean of its divisors is an integer number (5271552).

Almost surely, 2^105020139 is an apocalyptic number.

105020139 is a deficient number, since it is larger than the sum of its proper divisors (63669525).

105020139 is a wasteful number, since it uses less digits than its factorization.

105020139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 105020139 is about 10247.9334014229. The cubic root of 105020139 is about 471.7995578937.

The spelling of 105020139 in words is "one hundred five million, twenty thousand, one hundred thirty-nine".