20398742 has 64 divisors (see below), whose sum is σ = 42094080. Its totient is φ = 7174656.

The previous prime is 20398733. The next prime is 20398757. The reversal of 20398742 is 24789302.

It is a super-2 number, since 2×20398742² = 832217350365128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58613 + ... + 58959.

It is an arithmetic number, because the mean of its divisors is an integer number (657720).

Almost surely, 2^20398742 is an apocalyptic number.

20398742 is an abundant number, since it is smaller than the sum of its proper divisors (21695338).

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

20398742 is a wasteful number, since it uses less digits than its factorization.

20398742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20398742 is about 4516.4966511667. The cubic root of 20398742 is about 273.2338249055.

The spelling of 20398742 in words is "twenty million, three hundred ninety-eight thousand, seven hundred forty-two".