20345972 has 6 divisors (see below), whose sum is σ = 35605458. Its totient is φ = 10172984.

The previous prime is 20345953. The next prime is 20345987. The reversal of 20345972 is 27954302.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13512976 + 6832996 = 3676^2 + 2614^2 .

It is a congruent number.

It is an unprimeable number.

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, 2543243 + ... + 2543250.

It is an arithmetic number, because the mean of its divisors is an integer number (5934243).

Almost surely, 2^20345972 is an apocalyptic number.

It is an amenable number.

20345972 is a deficient number, since it is larger than the sum of its proper divisors (15259486).

20345972 is a wasteful number, since it uses less digits than its factorization.

20345972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5086497 (or 5086495 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20345972 is about 4510.6509508052. The cubic root of 20345972 is about 272.9980097088.

The spelling of 20345972 in words is "twenty million, three hundred forty-five thousand, nine hundred seventy-two".