20072136 has 64 divisors (see below), whose sum is σ = 57790080. Its totient is φ = 5690880.

The previous prime is 20072131. The next prime is 20072141. The reversal of 20072136 is 63127002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20072131) and next prime (20072141).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20072131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25996 + ... + 26756.

It is an arithmetic number, because the mean of its divisors is an integer number (902970).

Almost surely, 2^20072136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20072136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28895040).

20072136 is an abundant number, since it is smaller than the sum of its proper divisors (37717944).

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

20072136 is a wasteful number, since it uses less digits than its factorization.

20072136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934 (or 930 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20072136 is about 4480.1937458106. The cubic root of 20072136 is about 271.7677154716.

Adding to 20072136 its reverse (63127002), we get a palindrome (83199138).

The spelling of 20072136 in words is "twenty million, seventy-two thousand, one hundred thirty-six".