20490876 has 144 divisors (see below), whose sum is σ = 63551488. Its totient is φ = 5443200.

The previous prime is 20490839. The next prime is 20490917. The reversal of 20490876 is 67809402.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20490876.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 335886 + ... + 335946.

Almost surely, 2^20490876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20490876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31775744).

20490876 is an abundant number, since it is smaller than the sum of its proper divisors (43060612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20490876 is a wasteful number, since it uses less digits than its factorization.

20490876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20490876 is about 4526.6848796884. The cubic root of 20490876 is about 273.6445744038.

The spelling of 20490876 in words is "twenty million, four hundred ninety thousand, eight hundred seventy-six".