20629897 has 4 divisors (see below), whose sum is σ = 20638996. Its totient is φ = 20620800.

The previous prime is 20629883. The next prime is 20629901. The reversal of 20629897 is 79892602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11485321 + 9144576 = 3389^2 + 3024^2 .

It is a cyclic number.

It is not a de Polignac number, because 20629897 - 2²³ = 12241289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20629867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1897 + ... + 6697.

It is an arithmetic number, because the mean of its divisors is an integer number (5159749).

Almost surely, 2^20629897 is an apocalyptic number.

It is an amenable number.

20629897 is a deficient number, since it is larger than the sum of its proper divisors (9099).

20629897 is an equidigital number, since it uses as much as digits as its factorization.

20629897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9098.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 20629897 is about 4542.0146411037. The cubic root of 20629897 is about 274.2620302255.

It can be divided in two parts, 206 and 29897, that added together give a palindrome (30103).

The spelling of 20629897 in words is "twenty million, six hundred twenty-nine thousand, eight hundred ninety-seven".