20015402406 has 32 divisors (see below), whose sum is σ = 40797250560. Its totient is φ = 6544128864.

The previous prime is 20015402399. The next prime is 20015402413. The reversal of 20015402406 is 60420451002.

It is an interprime number because it is at equal distance from previous prime (20015402399) and next prime (20015402413).

It is a super-2 number, since 2×20015402406² (a number of 21 digits) 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 15 ways as a sum of consecutive naturals, for example, 1672761 + ... + 1684683.

It is an arithmetic number, because the mean of its divisors is an integer number (1274914080).

Almost surely, 2^20015402406 is an apocalyptic number.

20015402406 is an abundant number, since it is smaller than the sum of its proper divisors (20781848154).

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

20015402406 is a wasteful number, since it uses less digits than its factorization.

20015402406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17260.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 20015402406 its reverse (60420451002), we get a palindrome (80435853408).

The spelling of 20015402406 in words is "twenty billion, fifteen million, four hundred two thousand, four hundred six".