20533420 has 24 divisors (see below), whose sum is σ = 43520400. Its totient is φ = 8137152.

The previous prime is 20533391. The next prime is 20533427. The reversal of 20533420 is 2433502.

It is not an unprimeable number, because it can be changed into a prime (20533427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2530 + ... + 6889.

It is an arithmetic number, because the mean of its divisors is an integer number (1813350).

Almost surely, 2^20533420 is an apocalyptic number.

20533420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20533420 is an abundant number, since it is smaller than the sum of its proper divisors (22986980).

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

20533420 is a wasteful number, since it uses less digits than its factorization.

20533420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9537 (or 9535 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 20533420 is about 4531.3816877416. The cubic root of 20533420 is about 273.8338275279.

Adding to 20533420 its reverse (2433502), we get a palindrome (22966922).

The spelling of 20533420 in words is "twenty million, five hundred thirty-three thousand, four hundred twenty".