20402160 has 40 divisors (see below), whose sum is σ = 63247440. Its totient is φ = 5440512.

The previous prime is 20402153. The next prime is 20402189. The reversal of 20402160 is 6120402.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 42265 + ... + 42744.

It is an arithmetic number, because the mean of its divisors is an integer number (1581186).

Almost surely, 2^20402160 is an apocalyptic number.

20402160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20402160 is an abundant number, since it is smaller than the sum of its proper divisors (42845280).

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

20402160 is a wasteful number, since it uses less digits than its factorization.

20402160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85025 (or 85019 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20402160 is about 4516.8750259444. The cubic root of 20402160 is about 273.2490850141.

Adding to 20402160 its reverse (6120402), we get a palindrome (26522562).

The spelling of 20402160 in words is "twenty million, four hundred two thousand, one hundred sixty".