20878368 has 48 divisors (see below), whose sum is σ = 62637120. Its totient is φ = 5965056.

The previous prime is 20878337. The next prime is 20878373. The reversal of 20878368 is 86387802.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-3 number, since 3×20878368³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14863 + ... + 16206.

It is an arithmetic number, because the mean of its divisors is an integer number (1304940).

Almost surely, 2^20878368 is an apocalyptic number.

20878368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20878368 is an abundant number, since it is smaller than the sum of its proper divisors (41758752).

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

20878368 is a wasteful number, since it uses less digits than its factorization.

20878368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31089 (or 31081 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 20878368 is about 4569.2852832801. The cubic root of 20878368 is about 275.3587296401.

The spelling of 20878368 in words is "twenty million, eight hundred seventy-eight thousand, three hundred sixty-eight".