20697577 has 8 divisors (see below), whose sum is σ = 21316064. Its totient is φ = 20085408.

The previous prime is 20697559. The next prime is 20697581. The reversal of 20697577 is 77579602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20697577 - 2¹⁹ = 20173289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20697077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5533 + ... + 8485.

It is an arithmetic number, because the mean of its divisors is an integer number (2664508).

Almost surely, 2^20697577 is an apocalyptic number.

It is an amenable number.

20697577 is a deficient number, since it is larger than the sum of its proper divisors (618487).

20697577 is a wasteful number, since it uses less digits than its factorization.

20697577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 20697577 is about 4549.4589788237. The cubic root of 20697577 is about 274.5616244249.

The spelling of 20697577 in words is "twenty million, six hundred ninety-seven thousand, five hundred seventy-seven".