20276640 has 72 divisors (see below), whose sum is σ = 69198948. Its totient is φ = 5406720.

The previous prime is 20276621. The next prime is 20276657. The reversal of 20276640 is 4667202.

It can be written as a sum of positive squares in 2 ways, for example, as 20034576 + 242064 = 4476^2 + 492^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×20276640² = 822284259379200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5601 + ... + 8480.

Almost surely, 2^20276640 is an apocalyptic number.

20276640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20276640 is an abundant number, since it is smaller than the sum of its proper divisors (48922308).

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

20276640 is a wasteful number, since it uses less digits than its factorization.

20276640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14102 (or 14091 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20276640 is about 4502.9590271287. The cubic root of 20276640 is about 272.6875627032.

The spelling of 20276640 in words is "twenty million, two hundred seventy-six thousand, six hundred forty".