20878536 has 32 divisors (see below), whose sum is σ = 59653440. Its totient is φ = 5965248.

The previous prime is 20878523. The next prime is 20878537. The reversal of 20878536 is 63587802.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20878494 and 20878503.

It is not an unprimeable number, because it can be changed into a prime (20878537) 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, 61971 + ... + 62306.

It is an arithmetic number, because the mean of its divisors is an integer number (1864170).

Almost surely, 2^20878536 is an apocalyptic number.

It is an amenable number.

20878536 is an abundant number, since it is smaller than the sum of its proper divisors (38774904).

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

20878536 is a wasteful number, since it uses less digits than its factorization.

20878536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124293 (or 124289 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 20878536 is about 4569.3036668622. The cubic root of 20878536 is about 275.3594682059.

The spelling of 20878536 in words is "twenty million, eight hundred seventy-eight thousand, five hundred thirty-six".