20402243415 has 128 divisors (see below), whose sum is σ = 39770496000. Its totient is φ = 9883980288.

The previous prime is 20402243353. The next prime is 20402243419. The reversal of 20402243415 is 51434220402.

20402243415 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 2 + 243 + 415 = 666.

It is not a de Polignac number, because 20402243415 - 2¹¹ = 20402241367 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402243419) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11677572 + ... + 11679318.

It is an arithmetic number, because the mean of its divisors is an integer number (310707000).

Almost surely, 2^20402243415 is an apocalyptic number.

20402243415 is a deficient number, since it is larger than the sum of its proper divisors (19368252585).

20402243415 is a wasteful number, since it uses less digits than its factorization.

20402243415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966 (or 1960 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 20402243415 its reverse (51434220402), we get a palindrome (71836463817).

The spelling of 20402243415 in words is "twenty billion, four hundred two million, two hundred forty-three thousand, four hundred fifteen".