20938155 has 16 divisors (see below), whose sum is σ = 38287104. Its totient is φ = 9571680.

The previous prime is 20938117. The next prime is 20938193. The reversal of 20938155 is 55183902.

It is an interprime number because it is at equal distance from previous prime (20938117) and next prime (20938193).

It is not a de Polignac number, because 20938155 - 2⁶ = 20938091 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, 99601 + ... + 99810.

It is an arithmetic number, because the mean of its divisors is an integer number (2392944).

Almost surely, 2^20938155 is an apocalyptic number.

20938155 is a deficient number, since it is larger than the sum of its proper divisors (17348949).

20938155 is a wasteful number, since it uses less digits than its factorization.

20938155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199426.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 20938155 is about 4575.8228768168. The cubic root of 20938155 is about 275.6213169432.

The spelling of 20938155 in words is "twenty million, nine hundred thirty-eight thousand, one hundred fifty-five".