20261249 has 4 divisors (see below), whose sum is σ = 20604720. Its totient is φ = 19917780.

The previous prime is 20261231. The next prime is 20261261. The reversal of 20261249 is 94216202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94216202 = 2 ⋅47108101.

It is a cyclic number.

It is not a de Polignac number, because 20261249 - 2⁸ = 20260993 is a prime.

It is a super-2 number, since 2×20261249² = 821036422080002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20261279) 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, 171647 + ... + 171764.

It is an arithmetic number, because the mean of its divisors is an integer number (5151180).

Almost surely, 2^20261249 is an apocalyptic number.

It is an amenable number.

20261249 is a deficient number, since it is larger than the sum of its proper divisors (343471).

20261249 is an equidigital number, since it uses as much as digits as its factorization.

20261249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343470.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20261249 is about 4501.2497153568. The cubic root of 20261249 is about 272.6185506673.

The spelling of 20261249 in words is "twenty million, two hundred sixty-one thousand, two hundred forty-nine".