20351340 has 36 divisors (see below), whose sum is σ = 61732944. Its totient is φ = 5426976.

The previous prime is 20351339. The next prime is 20351371. The reversal of 20351340 is 4315302.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56352 + ... + 56711.

It is an arithmetic number, because the mean of its divisors is an integer number (1714804).

Almost surely, 2^20351340 is an apocalyptic number.

20351340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20351340 is an abundant number, since it is smaller than the sum of its proper divisors (41381604).

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

20351340 is a wasteful number, since it uses less digits than its factorization.

20351340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113078 (or 113073 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20351340 is about 4511.2459476291. The cubic root of 20351340 is about 273.0220164992.

Adding to 20351340 its reverse (4315302), we get a palindrome (24666642).

It can be divided in two parts, 2035 and 1340, that added together give a cube (3375 = 15³).

The spelling of 20351340 in words is "twenty million, three hundred fifty-one thousand, three hundred forty".