20412947 has 4 divisors (see below), whose sum is σ = 20424816. Its totient is φ = 20401080.

The previous prime is 20412929. The next prime is 20412949. The reversal of 20412947 is 74921402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74921402 = 2 ⋅37460701.

It is a cyclic number.

It is not a de Polignac number, because 20412947 - 2¹² = 20408851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20412949) 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, 2804 + ... + 6977.

It is an arithmetic number, because the mean of its divisors is an integer number (5106204).

Almost surely, 2^20412947 is an apocalyptic number.

20412947 is a deficient number, since it is larger than the sum of its proper divisors (11869).

20412947 is an equidigital number, since it uses as much as digits as its factorization.

20412947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11868.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20412947 is about 4518.0689459104. The cubic root of 20412947 is about 273.2972338140.

The spelling of 20412947 in words is "twenty million, four hundred twelve thousand, nine hundred forty-seven".