20424641 has 4 divisors (see below), whose sum is σ = 20712384. Its totient is φ = 20136900.

The previous prime is 20424631. The next prime is 20424653. The reversal of 20424641 is 14642402.

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: 14642402 = 2 ⋅7321201.

It is a cyclic number.

It is not a de Polignac number, because 20424641 - 2⁶ = 20424577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20424631) 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, 143765 + ... + 143906.

It is an arithmetic number, because the mean of its divisors is an integer number (5178096).

Almost surely, 2^20424641 is an apocalyptic number.

It is an amenable number.

20424641 is a deficient number, since it is larger than the sum of its proper divisors (287743).

20424641 is an equidigital number, since it uses as much as digits as its factorization.

20424641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287742.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20424641 is about 4519.3628975775. The cubic root of 20424641 is about 273.3494119367.

The spelling of 20424641 in words is "twenty million, four hundred twenty-four thousand, six hundred forty-one".