20697479 has 16 divisors (see below), whose sum is σ = 23950080. Its totient is φ = 17688960.

The previous prime is 20697463. The next prime is 20697487. The reversal of 20697479 is 97479602.

It is a cyclic number.

It is not a de Polignac number, because 20697479 - 2⁴ = 20697463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20697379) 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, 34607 + ... + 35199.

It is an arithmetic number, because the mean of its divisors is an integer number (1496880).

Almost surely, 2^20697479 is an apocalyptic number.

20697479 is a deficient number, since it is larger than the sum of its proper divisors (3252601).

20697479 is a wasteful number, since it uses less digits than its factorization.

20697479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 20697479 is about 4549.4482082996. The cubic root of 20697479 is about 274.5611910878.

The spelling of 20697479 in words is "twenty million, six hundred ninety-seven thousand, four hundred seventy-nine".