20291028 has 24 divisors (see below), whose sum is σ = 48354432. Its totient is φ = 6619584.

The previous prime is 20290999. The next prime is 20291053. The reversal of 20291028 is 82019202.

It is a junction number, because it is equal to n+sod(n) for n = 20290989 and 20291007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17425 + ... + 18552.

It is an arithmetic number, because the mean of its divisors is an integer number (2014768).

Almost surely, 2^20291028 is an apocalyptic number.

It is an amenable number.

20291028 is an abundant number, since it is smaller than the sum of its proper divisors (28063404).

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

20291028 is a wasteful number, since it uses less digits than its factorization.

20291028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36031 (or 36029 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20291028 is about 4504.5563599538. The cubic root of 20291028 is about 272.7520457901.

The spelling of 20291028 in words is "twenty million, two hundred ninety-one thousand, twenty-eight".