20874478 has 16 divisors (see below), whose sum is σ = 33003936. Its totient is φ = 9882400.

The previous prime is 20874473. The next prime is 20874493. The reversal of 20874478 is 87447802.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20874478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20874473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2400 + ... + 6892.

It is an arithmetic number, because the mean of its divisors is an integer number (2062746).

Almost surely, 2^20874478 is an apocalyptic number.

20874478 is a deficient number, since it is larger than the sum of its proper divisors (12129458).

20874478 is a wasteful number, since it uses less digits than its factorization.

20874478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4619.

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 20874478 is about 4568.8595951287. The cubic root of 20874478 is about 275.3416272180.

The spelling of 20874478 in words is "twenty million, eight hundred seventy-four thousand, four hundred seventy-eight".