20716426 has 4 divisors (see below), whose sum is σ = 31074642. Its totient is φ = 10358212.

The previous prime is 20716417. The next prime is 20716429. The reversal of 20716426 is 62461702.

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

It can be written as a sum of positive squares in only one way, i.e., 18481401 + 2235025 = 4299^2 + 1495^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20716394 and 20716403.

It is not an unprimeable number, because it can be changed into a prime (20716429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5179105 + ... + 5179108.

Almost surely, 2^20716426 is an apocalyptic number.

20716426 is a deficient number, since it is larger than the sum of its proper divisors (10358216).

20716426 is a wasteful number, since it uses less digits than its factorization.

20716426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10358215.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20716426 is about 4551.5300724042. The cubic root of 20716426 is about 274.6449456410.

The spelling of 20716426 in words is "twenty million, seven hundred sixteen thousand, four hundred twenty-six".