20469897 has 48 divisors (see below), whose sum is σ = 36400000. Its totient is φ = 11049696.

The previous prime is 20469893. The next prime is 20469913. The reversal of 20469897 is 79896402.

It is a happy number.

It is not a de Polignac number, because 20469897 - 2² = 20469893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20469893) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58479 + ... + 58827.

Almost surely, 2^20469897 is an apocalyptic number.

It is an amenable number.

20469897 is a deficient number, since it is larger than the sum of its proper divisors (15930103).

20469897 is a wasteful number, since it uses less digits than its factorization.

20469897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 20469897 is about 4524.3670275520. The cubic root of 20469897 is about 273.5511547793.

The spelling of 20469897 in words is "twenty million, four hundred sixty-nine thousand, eight hundred ninety-seven".