20267478 has 72 divisors (see below), whose sum is σ = 55752840. Its totient is φ = 5261760.

The previous prime is 20267473. The next prime is 20267537. The reversal of 20267478 is 87476202.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20267473) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8658 + ... + 10746.

It is an arithmetic number, because the mean of its divisors is an integer number (774345).

Almost surely, 2^20267478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20267478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27876420).

20267478 is an abundant number, since it is smaller than the sum of its proper divisors (35485362).

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

20267478 is a wasteful number, since it uses less digits than its factorization.

20267478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122 (or 2112 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 20267478 is about 4501.9415811403. The cubic root of 20267478 is about 272.6464852229.

The spelling of 20267478 in words is "twenty million, two hundred sixty-seven thousand, four hundred seventy-eight".