20432437 has 2 divisors, whose sum is σ = 20432438. Its totient is φ = 20432436.

The previous prime is 20432407. The next prime is 20432449. The reversal of 20432437 is 73423402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12103441 + 8328996 = 3479^2 + 2886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20432437 - 2¹⁵ = 20399669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20432407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10216218 + 10216219.

It is an arithmetic number, because the mean of its divisors is an integer number (10216219).

Almost surely, 2^20432437 is an apocalyptic number.

It is an amenable number.

20432437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20432437 is an equidigital number, since it uses as much as digits as its factorization.

20432437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 25.

The square root of 20432437 is about 4520.2253262420. The cubic root of 20432437 is about 273.3841862882.

Adding to 20432437 its reverse (73423402), we get a palindrome (93855839).

The spelling of 20432437 in words is "twenty million, four hundred thirty-two thousand, four hundred thirty-seven".