20970829 has 4 divisors (see below), whose sum is σ = 22877280. Its totient is φ = 19064380.

The previous prime is 20970827. The next prime is 20970853. The reversal of 20970829 is 92807902.

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.

It is a cyclic number.

It is not a de Polignac number, because 20970829 - 2¹ = 20970827 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20970821) 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, 953209 + ... + 953230.

It is an arithmetic number, because the mean of its divisors is an integer number (5719320).

Almost surely, 2^20970829 is an apocalyptic number.

It is an amenable number.

20970829 is a deficient number, since it is larger than the sum of its proper divisors (1906451).

20970829 is a wasteful number, since it uses less digits than its factorization.

20970829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906450.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 20970829 is about 4579.3917718404. The cubic root of 20970829 is about 275.7646114937.

The spelling of 20970829 in words is "twenty million, nine hundred seventy thousand, eight hundred twenty-nine".