20877636 has 24 divisors (see below), whose sum is σ = 52462144. Its totient is φ = 6423840.

The previous prime is 20877631. The next prime is 20877643. The reversal of 20877636 is 63677802.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 20877594 and 20877603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20877631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66760 + ... + 67071.

Almost surely, 2^20877636 is an apocalyptic number.

20877636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20877636 is an abundant number, since it is smaller than the sum of its proper divisors (31584508).

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

20877636 is a wasteful number, since it uses less digits than its factorization.

20877636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133851 (or 133849 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 20877636 is about 4569.2051825235. The cubic root of 20877636 is about 275.3555115574.

The spelling of 20877636 in words is "twenty million, eight hundred seventy-seven thousand, six hundred thirty-six".