20878242 has 32 divisors (see below), whose sum is σ = 52061184. Its totient is φ = 5422800.

The previous prime is 20878241. The next prime is 20878267. The reversal of 20878242 is 24287802.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20878241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22134 + ... + 23057.

It is an arithmetic number, because the mean of its divisors is an integer number (1626912).

Almost surely, 2^20878242 is an apocalyptic number.

20878242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20878242 is an abundant number, since it is smaller than the sum of its proper divisors (31182942).

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

20878242 is a wasteful number, since it uses less digits than its factorization.

20878242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45214.

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 20878242 is about 4569.2714955450. The cubic root of 20878242 is about 275.3581757132.

The spelling of 20878242 in words is "twenty million, eight hundred seventy-eight thousand, two hundred forty-two".