20136720 has 40 divisors (see below), whose sum is σ = 62424576. Its totient is φ = 5369728.

The previous prime is 20136709. The next prime is 20136731. The reversal of 20136720 is 2763102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20136709) and next prime (20136731).

It is a tau number, because it is divible by the number of its divisors (40).

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, 41712 + ... + 42191.

Almost surely, 2^20136720 is an apocalyptic number.

20136720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20136720 is an abundant number, since it is smaller than the sum of its proper divisors (42287856).

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

20136720 is a wasteful number, since it uses less digits than its factorization.

20136720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83919 (or 83913 counting only the distinct ones).

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

The square root of 20136720 is about 4487.3956812387. The cubic root of 20136720 is about 272.0588828691.

Adding to 20136720 its reverse (2763102), we get a palindrome (22899822).

The spelling of 20136720 in words is "twenty million, one hundred thirty-six thousand, seven hundred twenty".