20650161 has 16 divisors (see below), whose sum is σ = 31775744. Its totient is φ = 11684304.

The previous prime is 20650153. The next prime is 20650163. The reversal of 20650161 is 16105602.

It is a happy number.

It is not a de Polignac number, because 20650161 - 2³ = 20650153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20650163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2611 + ... + 6936.

It is an arithmetic number, because the mean of its divisors is an integer number (1985984).

Almost surely, 2^20650161 is an apocalyptic number.

20650161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20650161 is a deficient number, since it is larger than the sum of its proper divisors (11125583).

20650161 is a wasteful number, since it uses less digits than its factorization.

20650161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9660.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20650161 is about 4544.2448217498. The cubic root of 20650161 is about 274.3518000561.

Adding to 20650161 its reverse (16105602), we get a palindrome (36755763).

The spelling of 20650161 in words is "twenty million, six hundred fifty thousand, one hundred sixty-one".