20413749 has 4 divisors (see below), whose sum is σ = 27218336. Its totient is φ = 13609164.

The previous prime is 20413739. The next prime is 20413801. The reversal of 20413749 is 94731402.

It is a happy number.

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.

It is not a de Polignac number, because 20413749 - 2⁷ = 20413621 is a prime.

It is a super-2 number, since 2×20413749² = 833442296470002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413739) 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, 3402289 + ... + 3402294.

It is an arithmetic number, because the mean of its divisors is an integer number (6804584).

Almost surely, 2^20413749 is an apocalyptic number.

It is an amenable number.

20413749 is a deficient number, since it is larger than the sum of its proper divisors (6804587).

20413749 is an equidigital number, since it uses as much as digits as its factorization.

20413749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6804586.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20413749 is about 4518.1576997710. The cubic root of 20413749 is about 273.3008129398.

The spelling of 20413749 in words is "twenty million, four hundred thirteen thousand, seven hundred forty-nine".