20428350 has 24 divisors (see below), whose sum is σ = 50662680. Its totient is φ = 5447520.

The previous prime is 20428319. The next prime is 20428379. The reversal of 20428350 is 5382402.

It is a self number, because there is not a number n which added to its sum of digits gives 20428350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67945 + ... + 68244.

It is an arithmetic number, because the mean of its divisors is an integer number (2110945).

Almost surely, 2^20428350 is an apocalyptic number.

20428350 is an abundant number, since it is smaller than the sum of its proper divisors (30234330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20428350 is a wasteful number, since it uses less digits than its factorization.

20428350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136204 (or 136199 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20428350 is about 4519.7732243996. The cubic root of 20428350 is about 273.3659571742.

The spelling of 20428350 in words is "twenty million, four hundred twenty-eight thousand, three hundred fifty".