20438489546 has 16 divisors (see below), whose sum is σ = 31035463200. Its totient is φ = 10093401648.

The previous prime is 20438489507. The next prime is 20438489549. The reversal of 20438489546 is 64598483402.

It is a happy number.

It is a super-2 number, since 2×20438489546² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20438489549) 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, 692540 + ... + 721448.

It is an arithmetic number, because the mean of its divisors is an integer number (1939716450).

Almost surely, 2^20438489546 is an apocalyptic number.

20438489546 is a deficient number, since it is larger than the sum of its proper divisors (10596973654).

20438489546 is a wasteful number, since it uses less digits than its factorization.

20438489546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33253.

The product of its (nonzero) digits is 6635520, while the sum is 53.

The spelling of 20438489546 in words is "twenty billion, four hundred thirty-eight million, four hundred eighty-nine thousand, five hundred forty-six".