20836920 has 192 divisors, whose sum is σ = 72969120. Its totient is φ = 4727808.

The previous prime is 20836909. The next prime is 20836927. The reversal of 20836920 is 2963802.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20836927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 563142 + ... + 563178.

Almost surely, 2^20836920 is an apocalyptic number.

20836920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20836920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36484560).

20836920 is an abundant number, since it is smaller than the sum of its proper divisors (52132200).

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

20836920 is a wasteful number, since it uses less digits than its factorization.

20836920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20836920 is about 4564.7475286154. The cubic root of 20836920 is about 275.1763937183.

It can be divided in two parts, 208 and 36920, that added together give a triangular number (37128 = T₂₇₂).

The spelling of 20836920 in words is "twenty million, eight hundred thirty-six thousand, nine hundred twenty".