20402402354 has 8 divisors (see below), whose sum is σ = 30605214828. Its totient is φ = 10200664080.

The previous prime is 20402402351. The next prime is 20402402381. The reversal of 20402402354 is 45320420402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16047062329 + 4355340025 = 126677^2 + 65995^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20402402351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219257 + ... + 298124.

Almost surely, 2^20402402354 is an apocalyptic number.

20402402354 is a deficient number, since it is larger than the sum of its proper divisors (10202812474).

20402402354 is a wasteful number, since it uses less digits than its factorization.

20402402354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537100.

The product of its (nonzero) digits is 7680, while the sum is 26.

Adding to 20402402354 its reverse (45320420402), we get a palindrome (65722822756).

The spelling of 20402402354 in words is "twenty billion, four hundred two million, four hundred two thousand, three hundred fifty-four".