20977590 has 16 divisors (see below), whose sum is σ = 50346288. Its totient is φ = 5594016.

The previous prime is 20977571. The next prime is 20977601. The reversal of 20977590 is 9577902.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349597 + ... + 349656.

It is an arithmetic number, because the mean of its divisors is an integer number (3146643).

Almost surely, 2^20977590 is an apocalyptic number.

20977590 is an abundant number, since it is smaller than the sum of its proper divisors (29368698).

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

20977590 is a wasteful number, since it uses less digits than its factorization.

20977590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699263.

The product of its (nonzero) digits is 39690, while the sum is 39.

The square root of 20977590 is about 4580.1299108213. The cubic root of 20977590 is about 275.7942438337.

The spelling of 20977590 in words is "twenty million, nine hundred seventy-seven thousand, five hundred ninety".