20907867 has 16 divisors (see below), whose sum is σ = 28574208. Its totient is φ = 13594560.

The previous prime is 20907863. The next prime is 20907877. The reversal of 20907867 is 76870902.

It is not a de Polignac number, because 20907867 - 2² = 20907863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20907863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21463 + ... + 22415.

It is an arithmetic number, because the mean of its divisors is an integer number (1785888).

Almost surely, 2^20907867 is an apocalyptic number.

20907867 is a deficient number, since it is larger than the sum of its proper divisors (7666341).

20907867 is a wasteful number, since it uses less digits than its factorization.

20907867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 20907867 is about 4572.5121104268. The cubic root of 20907867 is about 275.4883531911.

The spelling of 20907867 in words is "twenty million, nine hundred seven thousand, eight hundred sixty-seven".