20679447 has 16 divisors (see below), whose sum is σ = 28103040. Its totient is φ = 13524000.

The previous prime is 20679433. The next prime is 20679469. The reversal of 20679447 is 74497602.

It is not a de Polignac number, because 20679447 - 2⁶ = 20679383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41872 + ... + 42362.

It is an arithmetic number, because the mean of its divisors is an integer number (1756440).

Almost surely, 2^20679447 is an apocalyptic number.

20679447 is a deficient number, since it is larger than the sum of its proper divisors (7423593).

20679447 is a wasteful number, since it uses less digits than its factorization.

20679447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 20679447 is about 4547.4659976739. The cubic root of 20679447 is about 274.4814337760.

The spelling of 20679447 in words is "twenty million, six hundred seventy-nine thousand, four hundred forty-seven".