20420040446 has 32 divisors (see below), whose sum is σ = 33627273120. Its totient is φ = 9241674624.

The previous prime is 20420040437. The next prime is 20420040463. The reversal of 20420040446 is 64404002402.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3661316 + ... + 3666888.

It is an arithmetic number, because the mean of its divisors is an integer number (1050852285).

Almost surely, 2^20420040446 is an apocalyptic number.

20420040446 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20420040446 is a deficient number, since it is larger than the sum of its proper divisors (13207232674).

20420040446 is a wasteful number, since it uses less digits than its factorization.

20420040446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8300.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 20420040446 its reverse (64404002402), we get a palindrome (84824042848).

The spelling of 20420040446 in words is "twenty billion, four hundred twenty million, forty thousand, four hundred forty-six".