20990662 has 16 divisors (see below), whose sum is σ = 39255552. Its totient is φ = 8178120.

The previous prime is 20990657. The next prime is 20990677. The reversal of 20990662 is 26609902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67998 + ... + 68305.

It is an arithmetic number, because the mean of its divisors is an integer number (2453472).

Almost surely, 2^20990662 is an apocalyptic number.

20990662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20990662 is a deficient number, since it is larger than the sum of its proper divisors (18264890).

20990662 is a wasteful number, since it uses less digits than its factorization.

20990662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136323.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20990662 is about 4581.5567223379. The cubic root of 20990662 is about 275.8515181881.

The spelling of 20990662 in words is "twenty million, nine hundred ninety thousand, six hundred sixty-two".