20727128 has 8 divisors (see below), whose sum is σ = 38863380. Its totient is φ = 10363560.

The previous prime is 20727103. The next prime is 20727137. The reversal of 20727128 is 82172702.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20727128² = 859227670256768, 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 20727128.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 1295438 + ... + 1295453.

Almost surely, 2^20727128 is an apocalyptic number.

It is an amenable number.

20727128 is a deficient number, since it is larger than the sum of its proper divisors (18136252).

20727128 is a wasteful number, since it uses less digits than its factorization.

20727128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590897 (or 2590893 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20727128 is about 4552.7055692193. The cubic root of 20727128 is about 274.6922308921.

It can be divided in two parts, 20727 and 128, that multiplied together give a triangular number (2653056 = T₂₃₀₃).

The spelling of 20727128 in words is "twenty million, seven hundred twenty-seven thousand, one hundred twenty-eight".