20261855 has 4 divisors (see below), whose sum is σ = 24314232. Its totient is φ = 16209480.

The previous prime is 20261803. The next prime is 20261861. The reversal of 20261855 is 55816202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20261855 - 2⁸ = 20261599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026181 + ... + 2026190.

It is an arithmetic number, because the mean of its divisors is an integer number (6078558).

Almost surely, 2^20261855 is an apocalyptic number.

20261855 is a deficient number, since it is larger than the sum of its proper divisors (4052377).

20261855 is an equidigital number, since it uses as much as digits as its factorization.

20261855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052376.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 20261855 is about 4501.3170294926. The cubic root of 20261855 is about 272.6212685846.

The spelling of 20261855 in words is "twenty million, two hundred sixty-one thousand, eight hundred fifty-five".