20926691 has 8 divisors (see below), whose sum is σ = 21294240. Its totient is φ = 20561472.

The previous prime is 20926669. The next prime is 20926699. The reversal of 20926691 is 19662902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20926691 - 2⁶ = 20926627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20926699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31721 + ... + 32373.

It is an arithmetic number, because the mean of its divisors is an integer number (2661780).

Almost surely, 2^20926691 is an apocalyptic number.

20926691 is a deficient number, since it is larger than the sum of its proper divisors (367549).

20926691 is an equidigital number, since it uses as much as digits as its factorization.

20926691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 20926691 is about 4574.5700344404. The cubic root of 20926691 is about 275.5710052893.

The spelling of 20926691 in words is "twenty million, nine hundred twenty-six thousand, six hundred ninety-one".