20345764 has 6 divisors (see below), whose sum is σ = 35605094. Its totient is φ = 10172880.

The previous prime is 20345761. The next prime is 20345771. The reversal of 20345764 is 46754302.

It can be written as a sum of positive squares in only one way, i.e., 12460900 + 7884864 = 3530^2 + 2808^2 .

It is a super-2 number, since 2×20345764² = 827900225487392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20345761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2543217 + ... + 2543224.

Almost surely, 2^20345764 is an apocalyptic number.

It is an amenable number.

20345764 is a deficient number, since it is larger than the sum of its proper divisors (15259330).

20345764 is a wasteful number, since it uses less digits than its factorization.

20345764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5086445 (or 5086443 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 20345764 is about 4510.6278942072. The cubic root of 20345764 is about 272.9970794054.

The spelling of 20345764 in words is "twenty million, three hundred forty-five thousand, seven hundred sixty-four".