20606397 has 32 divisors (see below), whose sum is σ = 33530112. Its totient is φ = 10988544.

The previous prime is 20606371. The next prime is 20606419. The reversal of 20606397 is 79360602.

It is not a de Polignac number, because 20606397 - 2⁸ = 20606141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20606357) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70183 + ... + 70475.

It is an arithmetic number, because the mean of its divisors is an integer number (1047816).

Almost surely, 2^20606397 is an apocalyptic number.

It is an amenable number.

20606397 is a deficient number, since it is larger than the sum of its proper divisors (12923715).

20606397 is a wasteful number, since it uses less digits than its factorization.

20606397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517.

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 20606397 is about 4539.4269462125. The cubic root of 20606397 is about 274.1578512187.

Adding to 20606397 its reverse (79360602), we get a palindrome (99966999).

The spelling of 20606397 in words is "twenty million, six hundred six thousand, three hundred ninety-seven".