20261903 has 4 divisors (see below), whose sum is σ = 20809560. Its totient is φ = 19714248.

The previous prime is 20261897. The next prime is 20261911. The reversal of 20261903 is 30916202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30916202 = 2 ⋅15458101.

It is a cyclic number.

It is not a de Polignac number, because 20261903 - 2¹² = 20257807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20261993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273773 + ... + 273846.

It is an arithmetic number, because the mean of its divisors is an integer number (5202390).

Almost surely, 2^20261903 is an apocalyptic number.

20261903 is a deficient number, since it is larger than the sum of its proper divisors (547657).

20261903 is an equidigital number, since it uses as much as digits as its factorization.

20261903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547656.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20261903 is about 4501.3223612623. The cubic root of 20261903 is about 272.6214838629.

The spelling of 20261903 in words is "twenty million, two hundred sixty-one thousand, nine hundred three".