20849967 has 10 divisors (see below), whose sum is σ = 31146368. Its totient is φ = 13899924.

The previous prime is 20849963. The next prime is 20849977. The reversal of 20849967 is 76994802.

It is a happy number.

It is not a de Polignac number, because 20849967 - 2² = 20849963 is a prime.

It is a super-2 number, since 2×20849967² = 869442247802178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849963) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 128623 + ... + 128784.

Almost surely, 2^20849967 is an apocalyptic number.

20849967 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20849967 is a deficient number, since it is larger than the sum of its proper divisors (10296401).

20849967 is an equidigital number, since it uses as much as digits as its factorization.

20849967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257419 (or 257410 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 20849967 is about 4566.1764092072. The cubic root of 20849967 is about 275.2338154699.

The spelling of 20849967 in words is "twenty million, eight hundred forty-nine thousand, nine hundred sixty-seven".