20428502 has 8 divisors (see below), whose sum is σ = 30713256. Its totient is φ = 10190752.

The previous prime is 20428489. The next prime is 20428511. The reversal of 20428502 is 20582402.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10643 + ... + 12414.

It is an arithmetic number, because the mean of its divisors is an integer number (3839157).

Almost surely, 2^20428502 is an apocalyptic number.

20428502 is a deficient number, since it is larger than the sum of its proper divisors (10284754).

20428502 is a wasteful number, since it uses less digits than its factorization.

20428502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23502.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20428502 is about 4519.7900393713. The cubic root of 20428502 is about 273.3666351784.

The spelling of 20428502 in words is "twenty million, four hundred twenty-eight thousand, five hundred two".