20878337 has 2 divisors, whose sum is σ = 20878338. Its totient is φ = 20878336.

The previous prime is 20878313. The next prime is 20878373. The reversal of 20878337 is 73387802.

Together with next prime (20878373) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20421361 + 456976 = 4519^2 + 676^2 .

It is a cyclic number.

It is not a de Polignac number, because 20878337 - 2¹⁰ = 20877313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20878337.

It is not a weakly prime, because it can be changed into another prime (20878537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10439168 + 10439169.

It is an arithmetic number, because the mean of its divisors is an integer number (10439169).

Almost surely, 2^20878337 is an apocalyptic number.

It is an amenable number.

20878337 is a deficient number, since it is larger than the sum of its proper divisors (1).

20878337 is an equidigital number, since it uses as much as digits as its factorization.

20878337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 20878337 is about 4569.2818910634. The cubic root of 20878337 is about 275.3585933567.

The spelling of 20878337 in words is "twenty million, eight hundred seventy-eight thousand, three hundred thirty-seven".