20432641 has 4 divisors (see below), whose sum is σ = 20442672. Its totient is φ = 20422612.

The previous prime is 20432609. The next prime is 20432663. The reversal of 20432641 is 14623402.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14623402 = 2 ⋅7311701.

It is a cyclic number.

It is not a de Polignac number, because 20432641 - 2⁵ = 20432609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20432681) 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, 751 + ... + 6436.

It is an arithmetic number, because the mean of its divisors is an integer number (5110668).

Almost surely, 2^20432641 is an apocalyptic number.

It is an amenable number.

20432641 is a deficient number, since it is larger than the sum of its proper divisors (10031).

20432641 is an equidigital number, since it uses as much as digits as its factorization.

20432641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10030.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20432641 is about 4520.2478914325. The cubic root of 20432641 is about 273.3850961192.

The spelling of 20432641 in words is "twenty million, four hundred thirty-two thousand, six hundred forty-one".