20989699 has 8 divisors (see below), whose sum is σ = 22138880. Its totient is φ = 19845000.

The previous prime is 20989651. The next prime is 20989711. The reversal of 20989699 is 99698902.

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

It is a cyclic number.

It is not a de Polignac number, because 20989699 - 2⁹ = 20989187 is a prime.

It is a super-2 number, since 2×20989699² = 881134928221202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20989609) 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, 13534 + ... + 15004.

It is an arithmetic number, because the mean of its divisors is an integer number (2767360).

Almost surely, 2^20989699 is an apocalyptic number.

20989699 is a deficient number, since it is larger than the sum of its proper divisors (1149181).

20989699 is a wasteful number, since it uses less digits than its factorization.

20989699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 20989699 is about 4581.4516258496. The cubic root of 20989699 is about 275.8472996603.

The spelling of 20989699 in words is "twenty million, nine hundred eighty-nine thousand, six hundred ninety-nine".