20671716 has 24 divisors (see below), whose sum is σ = 51944704. Its totient is φ = 6360480.

The previous prime is 20671661. The next prime is 20671723. The reversal of 20671716 is 61717602.

It is a happy 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, 66100 + ... + 66411.

Almost surely, 2^20671716 is an apocalyptic number.

20671716 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20671716 is an abundant number, since it is smaller than the sum of its proper divisors (31272988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20671716 is a wasteful number, since it uses less digits than its factorization.

20671716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132531 (or 132529 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 20671716 is about 4546.6158843694. The cubic root of 20671716 is about 274.4472246011.

The spelling of 20671716 in words is "twenty million, six hundred seventy-one thousand, seven hundred sixteen".