20380129 has 12 divisors (see below), whose sum is σ = 25863408. Its totient is φ = 15880200.

The previous prime is 20380123. The next prime is 20380169. The reversal of 20380129 is 92108302.

It is not a de Polignac number, because 20380129 - 2³ = 20380121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20380121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18367 + ... + 19444.

It is an arithmetic number, because the mean of its divisors is an integer number (2155284).

Almost surely, 2^20380129 is an apocalyptic number.

It is an amenable number.

20380129 is a deficient number, since it is larger than the sum of its proper divisors (5483279).

20380129 is a wasteful number, since it uses less digits than its factorization.

20380129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37836 (or 37829 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20380129 is about 4514.4356236411. The cubic root of 20380129 is about 273.1506947988.

The spelling of 20380129 in words is "twenty million, three hundred eighty thousand, one hundred twenty-nine".