20147897 has 16 divisors (see below), whose sum is σ = 25598592. Its totient is φ = 15400320.

The previous prime is 20147893. The next prime is 20147899. The reversal of 20147897 is 79874102.

It is a cyclic number.

It is not a de Polignac number, because 20147897 - 2² = 20147893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20147897.

It is not an unprimeable number, because it can be changed into a prime (20147891) 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, 1613 + ... + 6549.

It is an arithmetic number, because the mean of its divisors is an integer number (1599912).

Almost surely, 2^20147897 is an apocalyptic number.

It is an amenable number.

20147897 is a deficient number, since it is larger than the sum of its proper divisors (5450695).

20147897 is a wasteful number, since it uses less digits than its factorization.

20147897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 20147897 is about 4488.6408856134. The cubic root of 20147897 is about 272.1092094980.

The spelling of 20147897 in words is "twenty million, one hundred forty-seven thousand, eight hundred ninety-seven".