20978122 has 8 divisors (see below), whose sum is σ = 34327872. Its totient is φ = 9535500.

The previous prime is 20978117. The next prime is 20978123. The reversal of 20978122 is 22187902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20978123) 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, 476754 + ... + 476797.

It is an arithmetic number, because the mean of its divisors is an integer number (4290984).

Almost surely, 2^20978122 is an apocalyptic number.

20978122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20978122 is a deficient number, since it is larger than the sum of its proper divisors (13349750).

20978122 is a wasteful number, since it uses less digits than its factorization.

20978122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953564.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20978122 is about 4580.1879874084. The cubic root of 20978122 is about 275.7965752311.

The spelling of 20978122 in words is "twenty million, nine hundred seventy-eight thousand, one hundred twenty-two".