20829842 has 16 divisors (see below), whose sum is σ = 34280064. Its totient is φ = 9414000.

The previous prime is 20829841. The next prime is 20829857. The reversal of 20829842 is 24892802.

It is not an unprimeable number, because it can be changed into a prime (20829841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1367 + ... + 6597.

It is an arithmetic number, because the mean of its divisors is an integer number (2142504).

Almost surely, 2^20829842 is an apocalyptic number.

20829842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20829842 is a deficient number, since it is larger than the sum of its proper divisors (13450222).

20829842 is a wasteful number, since it uses less digits than its factorization.

20829842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 20829842 is about 4563.9721734472. The cubic root of 20829842 is about 275.1452323776.

The spelling of 20829842 in words is "twenty million, eight hundred twenty-nine thousand, eight hundred forty-two".