20401139 has 8 divisors (see below), whose sum is σ = 23565168. Its totient is φ = 17455360.

The previous prime is 20401127. The next prime is 20401141. The reversal of 20401139 is 93110402.

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 20401139 - 2²⁰ = 19352563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20401139.

It is not an unprimeable number, because it can be changed into a prime (20401109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54362 + ... + 54735.

It is an arithmetic number, because the mean of its divisors is an integer number (2945646).

Almost surely, 2^20401139 is an apocalyptic number.

20401139 is a deficient number, since it is larger than the sum of its proper divisors (3164029).

20401139 is a wasteful number, since it uses less digits than its factorization.

20401139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109125.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20401139 is about 4516.7620039139. The cubic root of 20401139 is about 273.2445268044.

The spelling of 20401139 in words is "twenty million, four hundred one thousand, one hundred thirty-nine".