20490829 has 4 divisors (see below), whose sum is σ = 20604220. Its totient is φ = 20377440.

The previous prime is 20490823. The next prime is 20490839. The reversal of 20490829 is 92809402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6786025 + 13704804 = 2605^2 + 3702^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20490829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20490794 and 20490803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20490823) 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, 56424 + ... + 56785.

It is an arithmetic number, because the mean of its divisors is an integer number (5151055).

Almost surely, 2^20490829 is an apocalyptic number.

It is an amenable number.

20490829 is a deficient number, since it is larger than the sum of its proper divisors (113391).

20490829 is a wasteful number, since it uses less digits than its factorization.

20490829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113390.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20490829 is about 4526.6796882483. The cubic root of 20490829 is about 273.6443651838.

The spelling of 20490829 in words is "twenty million, four hundred ninety thousand, eight hundred twenty-nine".