20345534 has 16 divisors (see below), whose sum is σ = 33922800. Its totient is φ = 9072960.

The previous prime is 20345531. The next prime is 20345573. The reversal of 20345534 is 43554302.

It is a super-4 number, since 4×20345534⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345531) 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, 7559 + ... + 9890.

It is an arithmetic number, because the mean of its divisors is an integer number (2120175).

Almost surely, 2^20345534 is an apocalyptic number.

20345534 is a deficient number, since it is larger than the sum of its proper divisors (13577266).

20345534 is a wasteful number, since it uses less digits than its factorization.

20345534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17515.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 20345534 is about 4510.6023987933. The cubic root of 20345534 is about 272.9960506972.

Adding to 20345534 its reverse (43554302), we get a palindrome (63899836).

The spelling of 20345534 in words is "twenty million, three hundred forty-five thousand, five hundred thirty-four".