20473557 has 8 divisors (see below), whose sum is σ = 29397984. Its totient is φ = 12599088.

The previous prime is 20473553. The next prime is 20473567. The reversal of 20473557 is 75537402.

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

It is not a de Polignac number, because 20473557 - 2² = 20473553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20473553) 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 7 ways as a sum of consecutive naturals, for example, 262443 + ... + 262520.

It is an arithmetic number, because the mean of its divisors is an integer number (3674748).

Almost surely, 2^20473557 is an apocalyptic number.

It is an amenable number.

20473557 is a deficient number, since it is larger than the sum of its proper divisors (8924427).

20473557 is a wasteful number, since it uses less digits than its factorization.

20473557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524979.

The product of its (nonzero) digits is 29400, while the sum is 33.

The square root of 20473557 is about 4524.7714859427. The cubic root of 20473557 is about 273.5674573782.

The spelling of 20473557 in words is "twenty million, four hundred seventy-three thousand, five hundred fifty-seven".