20398635 has 48 divisors (see below), whose sum is σ = 37250304. Its totient is φ = 10707552.

The previous prime is 20398627. The next prime is 20398643. The reversal of 20398635 is 53689302.

It is an interprime number because it is at equal distance from previous prime (20398627) and next prime (20398643).

It is not a de Polignac number, because 20398635 - 2³ = 20398627 is a prime.

It is a super-2 number, since 2×20398635² = 832208619726450, 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 20398635.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125064 + ... + 125226.

It is an arithmetic number, because the mean of its divisors is an integer number (776048).

Almost surely, 2^20398635 is an apocalyptic number.

20398635 is a deficient number, since it is larger than the sum of its proper divisors (16851669).

20398635 is a wasteful number, since it uses less digits than its factorization.

20398635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20398635 is about 4516.4848056868. The cubic root of 20398635 is about 273.2333471624.

The spelling of 20398635 in words is "twenty million, three hundred ninety-eight thousand, six hundred thirty-five".