20497869 has 24 divisors (see below), whose sum is σ = 35830080. Its totient is φ = 11023488.

The previous prime is 20497859. The next prime is 20497877. The reversal of 20497869 is 96879402.

It is a happy number.

It is not a de Polignac number, because 20497869 - 2⁸ = 20497613 is a prime.

It is a super-2 number, since 2×20497869² = 840325267082322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8499 + ... + 10640.

It is an arithmetic number, because the mean of its divisors is an integer number (1492920).

Almost surely, 2^20497869 is an apocalyptic number.

It is an amenable number.

20497869 is a deficient number, since it is larger than the sum of its proper divisors (15332211).

20497869 is a wasteful number, since it uses less digits than its factorization.

20497869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19169 (or 19166 counting only the distinct ones).

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

The square root of 20497869 is about 4527.4572333706. The cubic root of 20497869 is about 273.6757001084.

The spelling of 20497869 in words is "twenty million, four hundred ninety-seven thousand, eight hundred sixty-nine".