20156736 has 56 divisors (see below), whose sum is σ = 53665120. Its totient is φ = 6676992.

The previous prime is 20156729. The next prime is 20156737. The reversal of 20156736 is 63765102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20156737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52995 + ... + 53373.

Almost surely, 2^20156736 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 20156736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26832560).

20156736 is an abundant number, since it is smaller than the sum of its proper divisors (33508384).

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

20156736 is a wasteful number, since it uses less digits than its factorization.

20156736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20156736 is about 4489.6253741264. The cubic root of 20156736 is about 272.1489956465.

The spelling of 20156736 in words is "twenty million, one hundred fifty-six thousand, seven hundred thirty-six".