20474771 has 4 divisors (see below), whose sum is σ = 20666232. Its totient is φ = 20283312.

The previous prime is 20474759. The next prime is 20474777. The reversal of 20474771 is 17747402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17747402 = 2 ⋅8873701.

It is a cyclic number.

It is not a de Polignac number, because 20474771 - 2¹⁴ = 20458387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20474777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95570 + ... + 95783.

It is an arithmetic number, because the mean of its divisors is an integer number (5166558).

Almost surely, 2^20474771 is an apocalyptic number.

20474771 is a deficient number, since it is larger than the sum of its proper divisors (191461).

20474771 is a wasteful number, since it uses less digits than its factorization.

20474771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191460.

The product of its (nonzero) digits is 10976, while the sum is 32.

The square root of 20474771 is about 4524.9056343752. The cubic root of 20474771 is about 273.5728644232.

The spelling of 20474771 in words is "twenty million, four hundred seventy-four thousand, seven hundred seventy-one".