20426787 has 12 divisors (see below), whose sum is σ = 29910504. Its totient is φ = 13430880.

The previous prime is 20426773. The next prime is 20426801. The reversal of 20426787 is 78762402.

It is an interprime number because it is at equal distance from previous prime (20426773) and next prime (20426801).

It is not a de Polignac number, because 20426787 - 2¹² = 20422691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20426587) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14889 + ... + 16202.

It is an arithmetic number, because the mean of its divisors is an integer number (2492542).

Almost surely, 2^20426787 is an apocalyptic number.

20426787 is a deficient number, since it is larger than the sum of its proper divisors (9483717).

20426787 is a wasteful number, since it uses less digits than its factorization.

20426787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31170 (or 31167 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 20426787 is about 4519.6003141871. The cubic root of 20426787 is about 273.3589851330.

The spelling of 20426787 in words is "twenty million, four hundred twenty-six thousand, seven hundred eighty-seven".