20034945 has 80 divisors (see below), whose sum is σ = 42375168. Its totient is φ = 8864640.

The previous prime is 20034941. The next prime is 20034977. The reversal of 20034945 is 54943002.

It is not a de Polignac number, because 20034945 - 2² = 20034941 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20034941) 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 79 ways as a sum of consecutive naturals, for example, 104800 + ... + 104990.

Almost surely, 2^20034945 is an apocalyptic number.

It is an amenable number.

20034945 is an abundant number, since it is smaller than the sum of its proper divisors (22340223).

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

20034945 is a wasteful number, since it uses less digits than its factorization.

20034945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20034945 is about 4476.0412196493. The cubic root of 20034945 is about 271.5997618792.

Adding to 20034945 its reverse (54943002), we get a palindrome (74977947).

The spelling of 20034945 in words is "twenty million, thirty-four thousand, nine hundred forty-five".