20290479 has 8 divisors (see below), whose sum is σ = 29513472. Its totient is φ = 12297240.

The previous prime is 20290471. The next prime is 20290489. The reversal of 20290479 is 97409202.

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

It is not a de Polignac number, because 20290479 - 2³ = 20290471 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 614863 = 20290479 / (2 + 0 + 2 + 9 + 0 + 4 + 7 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20290471) 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, 307399 + ... + 307464.

It is an arithmetic number, because the mean of its divisors is an integer number (3689184).

Almost surely, 2^20290479 is an apocalyptic number.

20290479 is a deficient number, since it is larger than the sum of its proper divisors (9222993).

20290479 is a wasteful number, since it uses less digits than its factorization.

20290479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614877.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20290479 is about 4504.4954212431. The cubic root of 20290479 is about 272.7495858815.

The spelling of 20290479 in words is "twenty million, two hundred ninety thousand, four hundred seventy-nine".