20432790 has 128 divisors (see below), whose sum is σ = 65664000. Its totient is φ = 4416768.

The previous prime is 20432767. The next prime is 20432803. The reversal of 20432790 is 9723402.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35626 + ... + 36194.

It is an arithmetic number, because the mean of its divisors is an integer number (513000).

Almost surely, 2^20432790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20432790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32832000).

20432790 is an abundant number, since it is smaller than the sum of its proper divisors (45231210).

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

20432790 is a wasteful number, since it uses less digits than its factorization.

20432790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20432790 is about 4520.2643727994. The cubic root of 20432790 is about 273.3857606487.

The spelling of 20432790 in words is "twenty million, four hundred thirty-two thousand, seven hundred ninety".