20372645 has 16 divisors (see below), whose sum is σ = 25542000. Its totient is φ = 15579648.

The previous prime is 20372591. The next prime is 20372659. The reversal of 20372645 is 54627302.

It can be written as a sum of positive squares in 8 ways, for example, as 889249 + 19483396 = 943^2 + 4414^2 .

It is a cyclic number.

It is not a de Polignac number, because 20372645 - 2⁶ = 20372581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15161 + ... + 16449.

It is an arithmetic number, because the mean of its divisors is an integer number (1596375).

Almost surely, 2^20372645 is an apocalyptic number.

It is an amenable number.

20372645 is a deficient number, since it is larger than the sum of its proper divisors (5169355).

20372645 is a wasteful number, since it uses less digits than its factorization.

20372645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 20372645 is about 4513.6066510054. The cubic root of 20372645 is about 273.1172551988.

Adding to 20372645 its reverse (54627302), we get a palindrome (74999947).

It can be divided in two parts, 20 and 372645, that multiplied together give a square (7452900 = 2730²).

The spelling of 20372645 in words is "twenty million, three hundred seventy-two thousand, six hundred forty-five".