20829797 has 4 divisors (see below), whose sum is σ = 21024576. Its totient is φ = 20635020.

The previous prime is 20829749. The next prime is 20829821. The reversal of 20829797 is 79792802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79792802 = 2 ⋅39896401.

It is a cyclic number.

It is not a de Polignac number, because 20829797 - 2⁸ = 20829541 is a prime.

It is a super-2 number, since 2×20829797² = 867760886122418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20829707) 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, 97229 + ... + 97442.

It is an arithmetic number, because the mean of its divisors is an integer number (5256144).

Almost surely, 2^20829797 is an apocalyptic number.

It is an amenable number.

20829797 is a deficient number, since it is larger than the sum of its proper divisors (194779).

20829797 is a wasteful number, since it uses less digits than its factorization.

20829797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194778.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 20829797 is about 4563.9672435284. The cubic root of 20829797 is about 275.1450342397.

The spelling of 20829797 in words is "twenty million, eight hundred twenty-nine thousand, seven hundred ninety-seven".