20243949 has 32 divisors (see below), whose sum is σ = 31449600. Its totient is φ = 11453760.

The previous prime is 20243947. The next prime is 20243953. The reversal of 20243949 is 94934202.

It is not a de Polignac number, because 20243949 - 2¹ = 20243947 is a prime.

It is a super-2 number, since 2×20243949² = 819634942229202, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243947) 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, 51847 + ... + 52235.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^20243949 is an apocalyptic number.

It is an amenable number.

20243949 is a deficient number, since it is larger than the sum of its proper divisors (11205651).

20243949 is a wasteful number, since it uses less digits than its factorization.

20243949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 20243949 is about 4499.3276164334. The cubic root of 20243949 is about 272.5409370925.

The spelling of 20243949 in words is "twenty million, two hundred forty-three thousand, nine hundred forty-nine".