20672416 has 12 divisors (see below), whose sum is σ = 40698882. Its totient is φ = 10336192.

The previous prime is 20672413. The next prime is 20672417. The reversal of 20672416 is 61427602.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 8976016 = 3420^2 + 2996^2 .

It is not an unprimeable number, because it can be changed into a prime (20672411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322975 + ... + 323038.

Almost surely, 2^20672416 is an apocalyptic number.

It is an amenable number.

20672416 is a deficient number, since it is larger than the sum of its proper divisors (20026466).

20672416 is an equidigital number, since it uses as much as digits as its factorization.

20672416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646023 (or 646015 counting only the distinct ones).

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

The square root of 20672416 is about 4546.6928640496. The cubic root of 20672416 is about 274.4503224070.

The spelling of 20672416 in words is "twenty million, six hundred seventy-two thousand, four hundred sixteen".