20474149 has 4 divisors (see below), whose sum is σ = 20950336. Its totient is φ = 19997964.

The previous prime is 20474143. The next prime is 20474161. The reversal of 20474149 is 94147402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94147402 = 2 ⋅47073701.

It is a cyclic number.

It is not a de Polignac number, because 20474149 - 2⁷ = 20474021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20474149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20474143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238029 + ... + 238114.

It is an arithmetic number, because the mean of its divisors is an integer number (5237584).

Almost surely, 2^20474149 is an apocalyptic number.

It is an amenable number.

20474149 is a deficient number, since it is larger than the sum of its proper divisors (476187).

20474149 is an equidigital number, since it uses as much as digits as its factorization.

20474149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476186.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20474149 is about 4524.8369031381. The cubic root of 20474149 is about 273.5700941188.

The spelling of 20474149 in words is "twenty million, four hundred seventy-four thousand, one hundred forty-nine".