20638430 has 16 divisors (see below), whose sum is σ = 38430720. Its totient is φ = 7970592.

The previous prime is 20638421. The next prime is 20638451. The reversal of 20638430 is 3483602.

It is a self number, because there is not a number n which added to its sum of digits gives 20638430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35294 + ... + 35873.

It is an arithmetic number, because the mean of its divisors is an integer number (2401920).

Almost surely, 2^20638430 is an apocalyptic number.

20638430 is a deficient number, since it is larger than the sum of its proper divisors (17792290).

20638430 is a wasteful number, since it uses less digits than its factorization.

20638430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71203.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20638430 is about 4542.9538848639. The cubic root of 20638430 is about 274.2998387082.

The spelling of 20638430 in words is "twenty million, six hundred thirty-eight thousand, four hundred thirty".