20157755 has 32 divisors (see below), whose sum is σ = 26516160. Its totient is φ = 14676480.

The previous prime is 20157751. The next prime is 20157779. The reversal of 20157755 is 55775102.

It is not a de Polignac number, because 20157755 - 2² = 20157751 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20157751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 330425 + ... + 330485.

It is an arithmetic number, because the mean of its divisors is an integer number (828630).

Almost surely, 2^20157755 is an apocalyptic number.

20157755 is a deficient number, since it is larger than the sum of its proper divisors (6358405).

20157755 is a wasteful number, since it uses less digits than its factorization.

20157755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191.

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 20157755 is about 4489.7388565483. The cubic root of 20157755 is about 272.1535816263.

The spelling of 20157755 in words is "twenty million, one hundred fifty-seven thousand, seven hundred fifty-five".