20402102454 has 32 divisors (see below), whose sum is σ = 43191792000. Its totient is φ = 6406769664.

The previous prime is 20402102449. The next prime is 20402102467. The reversal of 20402102454 is 45420120402.

It is a happy number.

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, 479499 + ... + 520310.

It is an arithmetic number, because the mean of its divisors is an integer number (1349743500).

Almost surely, 2^20402102454 is an apocalyptic number.

20402102454 is an abundant number, since it is smaller than the sum of its proper divisors (22789689546).

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

20402102454 is a wasteful number, since it uses less digits than its factorization.

20402102454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000012.

The product of its (nonzero) digits is 2560, while the sum is 24.

Adding to 20402102454 its reverse (45420120402), we get a palindrome (65822222856).

The spelling of 20402102454 in words is "twenty billion, four hundred two million, one hundred two thousand, four hundred fifty-four".