20736432 has 80 divisors (see below), whose sum is σ = 62138880. Its totient is φ = 6608448.

The previous prime is 20736431. The next prime is 20736451. The reversal of 20736432 is 23463702.

It is a super-2 number, since 2×20736432² = 859999224181248, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20736396 and 20736405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20736431) 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, 8893 + ... + 10979.

It is an arithmetic number, because the mean of its divisors is an integer number (776736).

Almost surely, 2^20736432 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 20736432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31069440).

20736432 is an abundant number, since it is smaller than the sum of its proper divisors (41402448).

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

20736432 is a wasteful number, since it uses less digits than its factorization.

20736432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 27.

The square root of 20736432 is about 4553.7272645603. The cubic root of 20736432 is about 274.7333260566.

The spelling of 20736432 in words is "twenty million, seven hundred thirty-six thousand, four hundred thirty-two".