20380155 has 16 divisors (see below), whose sum is σ = 33490464. Its totient is φ = 10575360.

The previous prime is 20380123. The next prime is 20380169. The reversal of 20380155 is 55108302.

It is not a de Polignac number, because 20380155 - 2⁵ = 20380123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17806 + ... + 18915.

It is an arithmetic number, because the mean of its divisors is an integer number (2093154).

Almost surely, 2^20380155 is an apocalyptic number.

20380155 is a deficient number, since it is larger than the sum of its proper divisors (13110309).

20380155 is a wasteful number, since it uses less digits than its factorization.

20380155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36766.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 20380155 is about 4514.4385032914. The cubic root of 20380155 is about 273.1508109563.

Adding to 20380155 its reverse (55108302), we get a palindrome (75488457).

The spelling of 20380155 in words is "twenty million, three hundred eighty thousand, one hundred fifty-five".