20708438 has 4 divisors (see below), whose sum is σ = 31062660. Its totient is φ = 10354218.

The previous prime is 20708399. The next prime is 20708447. The reversal of 20708438 is 83480702.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5177108 + ... + 5177111.

It is an arithmetic number, because the mean of its divisors is an integer number (7765665).

Almost surely, 2^20708438 is an apocalyptic number.

20708438 is a deficient number, since it is larger than the sum of its proper divisors (10354222).

20708438 is a wasteful number, since it uses less digits than its factorization.

20708438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10354221.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20708438 is about 4550.6524806889. The cubic root of 20708438 is about 274.6096411944.

The spelling of 20708438 in words is "twenty million, seven hundred eight thousand, four hundred thirty-eight".