20690377 has 6 divisors (see below), whose sum is σ = 21979358. Its totient is φ = 19473024.

The previous prime is 20690357. The next prime is 20690393. The reversal of 20690377 is 77309602.

It can be written as a sum of positive squares in 3 ways, for example, as 7557001 + 13133376 = 2749^2 + 3624^2 .

It is not a de Polignac number, because 20690377 - 2¹¹ = 20688329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20690347) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35508 + ... + 36085.

Almost surely, 2^20690377 is an apocalyptic number.

It is an amenable number.

20690377 is a deficient number, since it is larger than the sum of its proper divisors (1288981).

20690377 is an equidigital number, since it uses as much as digits as its factorization.

20690377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71627 (or 71610 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 20690377 is about 4548.6676071131. The cubic root of 20690377 is about 274.5297837741.

Adding to 20690377 its reverse (77309602), we get a palindrome (97999979).

The spelling of 20690377 in words is "twenty million, six hundred ninety thousand, three hundred seventy-seven".