20155438 has 12 divisors (see below), whose sum is σ = 32117112. Its totient is φ = 9484640.

The previous prime is 20155427. The next prime is 20155441. The reversal of 20155438 is 83455102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16858 + ... + 18013.

It is an arithmetic number, because the mean of its divisors is an integer number (2676426).

Almost surely, 2^20155438 is an apocalyptic number.

20155438 is a deficient number, since it is larger than the sum of its proper divisors (11961674).

20155438 is a wasteful number, since it uses less digits than its factorization.

20155438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34907 (or 34890 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 20155438 is about 4489.4808163083. The cubic root of 20155438 is about 272.1431538115.

The spelling of 20155438 in words is "twenty million, one hundred fifty-five thousand, four hundred thirty-eight".