20746340 has 12 divisors (see below), whose sum is σ = 43567356. Its totient is φ = 8298528.

The previous prime is 20746303. The next prime is 20746351. The reversal of 20746340 is 4364702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13734436 + 7011904 = 3706^2 + 2648^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518639 + ... + 518678.

It is an arithmetic number, because the mean of its divisors is an integer number (3630613).

Almost surely, 2^20746340 is an apocalyptic number.

20746340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20746340 is an abundant number, since it is smaller than the sum of its proper divisors (22821016).

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

20746340 is a wasteful number, since it uses less digits than its factorization.

20746340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037326 (or 1037324 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20746340 is about 4554.8150346639. The cubic root of 20746340 is about 274.7770755369. Note that the first 3 decimals are identical.

The spelling of 20746340 in words is "twenty million, seven hundred forty-six thousand, three hundred forty".