20901243 has 16 divisors (see below), whose sum is σ = 30707712. Its totient is φ = 12540000.

The previous prime is 20901241. The next prime is 20901247. The reversal of 20901243 is 34210902.

It is not a de Polignac number, because 20901243 - 2¹ = 20901241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20901241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198 + ... + 6468.

It is an arithmetic number, because the mean of its divisors is an integer number (1919232).

Almost surely, 2^20901243 is an apocalyptic number.

20901243 is a deficient number, since it is larger than the sum of its proper divisors (9806469).

20901243 is a wasteful number, since it uses less digits than its factorization.

20901243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6386.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20901243 is about 4571.7877247309. The cubic root of 20901243 is about 275.4592568451.

It can be divided in two parts, 2090 and 1243, that added together give a palindrome (3333).

The spelling of 20901243 in words is "twenty million, nine hundred one thousand, two hundred forty-three".