20836788 has 24 divisors (see below), whose sum is σ = 55564992. Its totient is φ = 5953344.

The previous prime is 20836721. The next prime is 20836793. The reversal of 20836788 is 88763802.

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

It is a congruent number.

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, 123945 + ... + 124112.

It is an arithmetic number, because the mean of its divisors is an integer number (2315208).

Almost surely, 2^20836788 is an apocalyptic number.

20836788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20836788 is an abundant number, since it is smaller than the sum of its proper divisors (34728204).

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

20836788 is a wasteful number, since it uses less digits than its factorization.

20836788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248071 (or 248069 counting only the distinct ones).

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

The square root of 20836788 is about 4564.7330699615. The cubic root of 20836788 is about 275.1758126446.

The spelling of 20836788 in words is "twenty million, eight hundred thirty-six thousand, seven hundred eighty-eight".