20953340 has 12 divisors (see below), whose sum is σ = 44002056. Its totient is φ = 8381328.

The previous prime is 20953321. The next prime is 20953351. The reversal of 20953340 is 4335902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523814 + ... + 523853.

It is an arithmetic number, because the mean of its divisors is an integer number (3666838).

Almost surely, 2^20953340 is an apocalyptic number.

20953340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20953340 is an abundant number, since it is smaller than the sum of its proper divisors (23048716).

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

20953340 is a wasteful number, since it uses less digits than its factorization.

20953340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047676 (or 1047674 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20953340 is about 4577.4818404883. The cubic root of 20953340 is about 275.6879305541.

The spelling of 20953340 in words is "twenty million, nine hundred fifty-three thousand, three hundred forty".