20690154 has 20 divisors (see below), whose sum is σ = 46361634. Its totient is φ = 6896664.

The previous prime is 20690149. The next prime is 20690161. The reversal of 20690154 is 45109602.

It can be written as a sum of positive squares in only one way, i.e., 13155129 + 7535025 = 3627^2 + 2745^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 63697 + ... + 64020.

Almost surely, 2^20690154 is an apocalyptic number.

20690154 is an abundant number, since it is smaller than the sum of its proper divisors (25671480).

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

20690154 is a wasteful number, since it uses less digits than its factorization.

20690154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127731 (or 127722 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20690154 is about 4548.6430943744. The cubic root of 20690154 is about 274.5287974804.

Adding to 20690154 its reverse (45109602), we get a palindrome (65799756).

The spelling of 20690154 in words is "twenty million, six hundred ninety thousand, one hundred fifty-four".