20034721 has 16 divisors (see below), whose sum is σ = 25522560. Its totient is φ = 15310080.

The previous prime is 20034719. The next prime is 20034727. The reversal of 20034721 is 12743002.

It is a cyclic number.

It is not a de Polignac number, because 20034721 - 2¹ = 20034719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (20034727) 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 15 ways as a sum of consecutive naturals, for example, 2170 + ... + 6691.

It is an arithmetic number, because the mean of its divisors is an integer number (1595160).

Almost surely, 2^20034721 is an apocalyptic number.

It is an amenable number.

20034721 is a deficient number, since it is larger than the sum of its proper divisors (5487839).

20034721 is a wasteful number, since it uses less digits than its factorization.

20034721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8904.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20034721 is about 4476.0161974685. The cubic root of 20034721 is about 271.5987496716.

Adding to 20034721 its reverse (12743002), we get a palindrome (32777723).

It can be divided in two parts, 2003 and 4721, that added together give a square (6724 = 82²).

The spelling of 20034721 in words is "twenty million, thirty-four thousand, seven hundred twenty-one".