20783061 has 64 divisors (see below), whose sum is σ = 36368640. Its totient is φ = 11757312.

The previous prime is 20783057. The next prime is 20783069. The reversal of 20783061 is 16038702.

It is not a de Polignac number, because 20783061 - 2² = 20783057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20783069) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 483306 + ... + 483348.

It is an arithmetic number, because the mean of its divisors is an integer number (568260).

Almost surely, 2^20783061 is an apocalyptic number.

It is an amenable number.

20783061 is a deficient number, since it is larger than the sum of its proper divisors (15585579).

20783061 is an equidigital number, since it uses as much as digits as its factorization.

20783061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20783061 is about 4558.8442614329. The cubic root of 20783061 is about 274.9390983594.

The spelling of 20783061 in words is "twenty million, seven hundred eighty-three thousand, sixty-one".