20229691 has 4 divisors (see below), whose sum is σ = 20271384. Its totient is φ = 20188000.

The previous prime is 20229667. The next prime is 20229709. The reversal of 20229691 is 19692202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19692202 = 2 ⋅9846101.

It is a cyclic number.

It is not a de Polignac number, because 20229691 - 2⁷ = 20229563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20229991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20110 + ... + 21091.

It is an arithmetic number, because the mean of its divisors is an integer number (5067846).

Almost surely, 2^20229691 is an apocalyptic number.

20229691 is a deficient number, since it is larger than the sum of its proper divisors (41693).

20229691 is an equidigital number, since it uses as much as digits as its factorization.

20229691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41692.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20229691 is about 4497.7428783780. The cubic root of 20229691 is about 272.4769376998.

The spelling of 20229691 in words is "twenty million, two hundred twenty-nine thousand, six hundred ninety-one".