20424278 has 32 divisors (see below), whose sum is σ = 37632000. Its totient is φ = 8287272.

The previous prime is 20424277. The next prime is 20424301. The reversal of 20424278 is 87242402.

It is a super-2 number, since 2×20424278² = 834302263642568, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20424278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12251 + ... + 13817.

It is an arithmetic number, because the mean of its divisors is an integer number (1176000).

Almost surely, 2^20424278 is an apocalyptic number.

20424278 is a deficient number, since it is larger than the sum of its proper divisors (17207722).

20424278 is a wasteful number, since it uses less digits than its factorization.

20424278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609 (or 1595 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 20424278 is about 4519.3227368711. The cubic root of 20424278 is about 273.3477925460.

It can be divided in two parts, 20424 and 278, that added together give a palindrome (20702).

The spelling of 20424278 in words is "twenty million, four hundred twenty-four thousand, two hundred seventy-eight".