20429858 has 8 divisors (see below), whose sum is σ = 30756252. Its totient is φ = 10177776.

The previous prime is 20429821. The next prime is 20429863. The reversal of 20429858 is 85892402.

It can be written as a sum of positive squares in 2 ways, for example, as 20403289 + 26569 = 4517^2 + 163^2 .

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

It is a Curzon number.

It is an unprimeable number.

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, 17885 + ... + 18992.

Almost surely, 2^20429858 is an apocalyptic number.

20429858 is a deficient number, since it is larger than the sum of its proper divisors (10326394).

20429858 is a wasteful number, since it uses less digits than its factorization.

20429858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37156.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 20429858 is about 4519.9400438501. The cubic root of 20429858 is about 273.3726835409.

The spelling of 20429858 in words is "twenty million, four hundred twenty-nine thousand, eight hundred fifty-eight".