20149656 has 64 divisors (see below), whose sum is σ = 53118720. Its totient is φ = 6357120.

The previous prime is 20149651. The next prime is 20149669. The reversal of 20149656 is 65694102.

20149656 = T₇₃ + T₇₄ + ... + T₄₉₄.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20149651) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 95391 + ... + 95601.

It is an arithmetic number, because the mean of its divisors is an integer number (829980).

Almost surely, 2^20149656 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 20149656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26559360).

20149656 is an abundant number, since it is smaller than the sum of its proper divisors (32969064).

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

20149656 is a wasteful number, since it uses less digits than its factorization.

20149656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20149656 is about 4488.8368203801. The cubic root of 20149656 is about 272.1171280444.

The spelling of 20149656 in words is "twenty million, one hundred forty-nine thousand, six hundred fifty-six".