20215967 has 2 divisors, whose sum is σ = 20215968. Its totient is φ = 20215966.

The previous prime is 20215883. The next prime is 20215973. The reversal of 20215967 is 76951202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20215967 - 2⁸ = 20215711 is a prime.

It is a super-3 number, since 3×20215967³ (a number of 23 digits) contains 333 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20215997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107983 + 10107984.

It is an arithmetic number, because the mean of its divisors is an integer number (10107984).

Almost surely, 2^20215967 is an apocalyptic number.

20215967 is a deficient number, since it is larger than the sum of its proper divisors (1).

20215967 is an equidigital number, since it uses as much as digits as its factorization.

20215967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 20215967 is about 4496.2169654055. The cubic root of 20215967 is about 272.4153068450.

The spelling of 20215967 in words is "twenty million, two hundred fifteen thousand, nine hundred sixty-seven".