20436897 has 16 divisors (see below), whose sum is σ = 29473920. Its totient is φ = 12521472.

The previous prime is 20436877. The next prime is 20436929. The reversal of 20436897 is 79863402.

It is not a de Polignac number, because 20436897 - 2¹⁰ = 20435873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20436877) 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, 9004 + ... + 11042.

It is an arithmetic number, because the mean of its divisors is an integer number (1842120).

Almost surely, 2^20436897 is an apocalyptic number.

It is an amenable number.

20436897 is a deficient number, since it is larger than the sum of its proper divisors (9037023).

20436897 is a wasteful number, since it uses less digits than its factorization.

20436897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 20436897 is about 4520.7186375620. The cubic root of 20436897 is about 273.4040763086.

The spelling of 20436897 in words is "twenty million, four hundred thirty-six thousand, eight hundred ninety-seven".