20276720 has 40 divisors (see below), whose sum is σ = 47581776. Its totient is φ = 8035328.

The previous prime is 20276719. The next prime is 20276747. The reversal of 20276720 is 2767202.

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

It is a super-2 number, since 2×20276720² = 822290747916800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20276720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7919 + ... + 10161.

Almost surely, 2^20276720 is an apocalyptic number.

20276720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20276720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23790888).

20276720 is an abundant number, since it is smaller than the sum of its proper divisors (27305056).

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

20276720 is a wasteful number, since it uses less digits than its factorization.

20276720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369 (or 2363 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 20276720 is about 4502.9679101677. The cubic root of 20276720 is about 272.6879213257.

The spelling of 20276720 in words is "twenty million, two hundred seventy-six thousand, seven hundred twenty".