20618716 has 12 divisors (see below), whose sum is σ = 36131032. Its totient is φ = 10295568.

The previous prime is 20618713. The next prime is 20618729. The reversal of 20618716 is 61781602.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20618713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391 + ... + 6433.

Almost surely, 2^20618716 is an apocalyptic number.

It is an amenable number.

20618716 is a deficient number, since it is larger than the sum of its proper divisors (15512316).

20618716 is a wasteful number, since it uses less digits than its factorization.

20618716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900 (or 6898 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20618716 is about 4540.7836328105. The cubic root of 20618716 is about 274.2124730557.

The spelling of 20618716 in words is "twenty million, six hundred eighteen thousand, seven hundred sixteen".