20402341551 has 24 divisors (see below), whose sum is σ = 30604981680. Its totient is φ = 13081399296.

The previous prime is 20402341549. The next prime is 20402341559. The reversal of 20402341551 is 15514320402.

It is not a de Polignac number, because 20402341551 - 2¹ = 20402341549 is a prime.

It is a super-2 number, since 2×20402341551² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402341559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85005 + ... + 219158.

It is an arithmetic number, because the mean of its divisors is an integer number (1275207570).

Almost surely, 2^20402341551 is an apocalyptic number.

20402341551 is a deficient number, since it is larger than the sum of its proper divisors (10202640129).

20402341551 is a wasteful number, since it uses less digits than its factorization.

20402341551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304455 (or 304452 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 20402341551 its reverse (15514320402), we get a palindrome (35916661953).

The spelling of 20402341551 in words is "twenty billion, four hundred two million, three hundred forty-one thousand, five hundred fifty-one".