20432015 has 4 divisors (see below), whose sum is σ = 24518424. Its totient is φ = 16345608.

The previous prime is 20431987. The next prime is 20432017. The reversal of 20432015 is 51023402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20432015 - 2⁶ = 20431951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20431984 and 20432002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20432017) 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, 2043197 + ... + 2043206.

It is an arithmetic number, because the mean of its divisors is an integer number (6129606).

Almost surely, 2^20432015 is an apocalyptic number.

20432015 is a deficient number, since it is larger than the sum of its proper divisors (4086409).

20432015 is an equidigital number, since it uses as much as digits as its factorization.

20432015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086408.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20432015 is about 4520.1786469121. The cubic root of 20432015 is about 273.3823041678.

Adding to 20432015 its reverse (51023402), we get a palindrome (71455417).

The spelling of 20432015 in words is "twenty million, four hundred thirty-two thousand, fifteen".