20486949 has 12 divisors (see below), whose sum is σ = 31775904. Its totient is φ = 11706744.

The previous prime is 20486933. The next prime is 20486953. The reversal of 20486949 is 94968402.

It is not a de Polignac number, because 20486949 - 2⁴ = 20486933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20486949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20486149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69537 + ... + 69830.

It is an arithmetic number, because the mean of its divisors is an integer number (2647992).

Almost surely, 2^20486949 is an apocalyptic number.

It is an amenable number.

20486949 is a deficient number, since it is larger than the sum of its proper divisors (11288955).

20486949 is a wasteful number, since it uses less digits than its factorization.

20486949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139384 (or 139377 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 20486949 is about 4526.2510977629. The cubic root of 20486949 is about 273.6270922994.

It can be divided in two parts, 204 and 86949, that added together give a triangular number (87153 = T₄₁₇).

The spelling of 20486949 in words is "twenty million, four hundred eighty-six thousand, nine hundred forty-nine".