20783534 has 16 divisors (see below), whose sum is σ = 32385408. Its totient is φ = 9995832.

The previous prime is 20783533. The next prime is 20783561. The reversal of 20783534 is 43538702.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20783534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20783531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3959 + ... + 7565.

It is an arithmetic number, because the mean of its divisors is an integer number (2024088).

Almost surely, 2^20783534 is an apocalyptic number.

20783534 is a deficient number, since it is larger than the sum of its proper divisors (11601874).

20783534 is a wasteful number, since it uses less digits than its factorization.

20783534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3719.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20783534 is about 4558.8961383212. The cubic root of 20783534 is about 274.9411841158.

The spelling of 20783534 in words is "twenty million, seven hundred eighty-three thousand, five hundred thirty-four".