20202139 has 8 divisors (see below), whose sum is σ = 20447648. Its totient is φ = 19958400.

The previous prime is 20202113. The next prime is 20202167. The reversal of 20202139 is 93120202.

20202139 = T₄₂ + T₄₃ + ... + T₄₉₄.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20202139 - 2⁵ = 20202107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20202179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50689 + ... + 51085.

It is an arithmetic number, because the mean of its divisors is an integer number (2555956).

Almost surely, 2^20202139 is an apocalyptic number.

20202139 is a deficient number, since it is larger than the sum of its proper divisors (245509).

20202139 is a wasteful number, since it uses less digits than its factorization.

20202139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20202139 is about 4494.6789651765. The cubic root of 20202139 is about 272.3531807366.

The spelling of 20202139 in words is "twenty million, two hundred two thousand, one hundred thirty-nine".