20123434 has 16 divisors (see below), whose sum is σ = 30792960. Its totient is φ = 9861280.

The previous prime is 20123431. The next prime is 20123437. The reversal of 20123434 is 43432102.

It is an interprime number because it is at equal distance from previous prime (20123431) and next prime (20123437).

It is not an unprimeable number, because it can be changed into a prime (20123431) 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, 22887 + ... + 23749.

It is an arithmetic number, because the mean of its divisors is an integer number (1924560).

Almost surely, 2^20123434 is an apocalyptic number.

20123434 is a deficient number, since it is larger than the sum of its proper divisors (10669526).

20123434 is a wasteful number, since it uses less digits than its factorization.

20123434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20123434 is about 4485.9150682999. The cubic root of 20123434 is about 271.9990358241. Note that the first 3 decimals are identical.

Adding to 20123434 its reverse (43432102), we get a palindrome (63555536).

The spelling of 20123434 in words is "twenty million, one hundred twenty-three thousand, four hundred thirty-four".