20719406 has 4 divisors (see below), whose sum is σ = 31079112. Its totient is φ = 10359702.

The previous prime is 20719399. The next prime is 20719411. The reversal of 20719406 is 60491702.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5179850 + ... + 5179853.

It is an arithmetic number, because the mean of its divisors is an integer number (7769778).

Almost surely, 2^20719406 is an apocalyptic number.

20719406 is a deficient number, since it is larger than the sum of its proper divisors (10359706).

20719406 is a wasteful number, since it uses less digits than its factorization.

20719406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10359705.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20719406 is about 4551.8574230747. The cubic root of 20719406 is about 274.6581139789.

The spelling of 20719406 in words is "twenty million, seven hundred nineteen thousand, four hundred six".