20472947 has 8 divisors (see below), whose sum is σ = 23648112. Its totient is φ = 17516800.

The previous prime is 20472943. The next prime is 20472971. The reversal of 20472947 is 74927402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20472947 - 2² = 20472943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20472943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54554 + ... + 54927.

It is an arithmetic number, because the mean of its divisors is an integer number (2956014).

Almost surely, 2^20472947 is an apocalyptic number.

20472947 is a deficient number, since it is larger than the sum of its proper divisors (3175165).

20472947 is a wasteful number, since it uses less digits than its factorization.

20472947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109509.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 20472947 is about 4524.7040787216. The cubic root of 20472947 is about 273.5647404133.

It can be divided in two parts, 2047 and 2947, that added together give a palindrome (4994).

The spelling of 20472947 in words is "twenty million, four hundred seventy-two thousand, nine hundred forty-seven".