20412542 has 4 divisors (see below), whose sum is σ = 30618816. Its totient is φ = 10206270.

The previous prime is 20412541. The next prime is 20412559. The reversal of 20412542 is 24521402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24521402 = 2 ⋅12260701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20412541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5103134 + ... + 5103137.

It is an arithmetic number, because the mean of its divisors is an integer number (7654704).

Almost surely, 2^20412542 is an apocalyptic number.

20412542 is a deficient number, since it is larger than the sum of its proper divisors (10206274).

20412542 is a wasteful number, since it uses less digits than its factorization.

20412542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206273.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 20412542 is about 4518.0241256549. The cubic root of 20412542 is about 273.2954263645.

Adding to 20412542 its reverse (24521402), we get a palindrome (44933944).

The spelling of 20412542 in words is "twenty million, four hundred twelve thousand, five hundred forty-two".