20849679 has 6 divisors (see below), whose sum is σ = 30116216. Its totient is φ = 13899780.

The previous prime is 20849677. The next prime is 20849681. The reversal of 20849679 is 97694802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20849677) and next prime (20849681).

It is not a de Polignac number, because 20849679 - 2¹ = 20849677 is a prime.

It is a super-2 number, since 2×20849679² = 869418228806082, 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 (20849677) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1158307 + ... + 1158324.

Almost surely, 2^20849679 is an apocalyptic number.

20849679 is a deficient number, since it is larger than the sum of its proper divisors (9266537).

20849679 is a wasteful number, since it uses less digits than its factorization.

20849679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316637 (or 2316634 counting only the distinct ones).

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

The square root of 20849679 is about 4566.1448728659. The cubic root of 20849679 is about 275.2325481985.

It can be divided in two parts, 20849 and 679, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 20849679 in words is "twenty million, eight hundred forty-nine thousand, six hundred seventy-nine".