20401278 has 8 divisors (see below), whose sum is σ = 40802568. Its totient is φ = 6800424.

The previous prime is 20401273. The next prime is 20401291. The reversal of 20401278 is 87210402.

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

20401278 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401273) 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, 1700101 + ... + 1700112.

It is an arithmetic number, because the mean of its divisors is an integer number (5100321).

Almost surely, 2^20401278 is an apocalyptic number.

20401278 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.

20401278 is a wasteful number, since it uses less digits than its factorization.

20401278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400218.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20401278 is about 4516.7773910167. Note that the first 3 decimals coincide. The cubic root of 20401278 is about 273.2451473728.

The spelling of 20401278 in words is "twenty million, four hundred one thousand, two hundred seventy-eight".