20401242 has 8 divisors (see below), whose sum is σ = 40802496. Its totient is φ = 6800412.

The previous prime is 20401223. The next prime is 20401273. The reversal of 20401242 is 24210402.

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

20401242 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1700098 + ... + 1700109.

It is an arithmetic number, because the mean of its divisors is an integer number (5100312).

Almost surely, 2^20401242 is an apocalyptic number.

20401242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20401242 is a wasteful number, since it uses less digits than its factorization.

20401242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400212.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20401242 is about 4516.7734058728. The cubic root of 20401242 is about 273.2449866503.

Adding to 20401242 its reverse (24210402), we get a palindrome (44611644).

The spelling of 20401242 in words is "twenty million, four hundred one thousand, two hundred forty-two".