20287398 has 16 divisors (see below), whose sum is σ = 41147136. Its totient is φ = 6667080.

The previous prime is 20287391. The next prime is 20287411. The reversal of 20287398 is 89378202.

It is a super-2 number, since 2×20287398² = 823157035220808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23386 + ... + 24237.

It is an arithmetic number, because the mean of its divisors is an integer number (2571696).

Almost surely, 2^20287398 is an apocalyptic number.

20287398 is an abundant number, since it is smaller than the sum of its proper divisors (20859738).

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

20287398 is a wasteful number, since it uses less digits than its factorization.

20287398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47699.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 20287398 is about 4504.1534165701. The cubic root of 20287398 is about 272.7357799973.

The spelling of 20287398 in words is "twenty million, two hundred eighty-seven thousand, three hundred ninety-eight".