20347842 has 16 divisors (see below), whose sum is σ = 42008832. Its totient is φ = 6563760.

The previous prime is 20347829. The next prime is 20347843. The reversal of 20347842 is 24874302.

It is not an unprimeable number, because it can be changed into a prime (20347843) 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, 54513 + ... + 54884.

It is an arithmetic number, because the mean of its divisors is an integer number (2625552).

Almost surely, 2^20347842 is an apocalyptic number.

20347842 is an abundant number, since it is smaller than the sum of its proper divisors (21660990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20347842 is a wasteful number, since it uses less digits than its factorization.

20347842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109433.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 20347842 is about 4510.8582331969. The cubic root of 20347842 is about 273.0063732092.

The spelling of 20347842 in words is "twenty million, three hundred forty-seven thousand, eight hundred forty-two".