20402402356 has 48 divisors (see below), whose sum is σ = 43214524416. Its totient is φ = 8238868704.

The previous prime is 20402402351. The next prime is 20402402381. The reversal of 20402402356 is 65320420402.

It is a super-2 number, since 2×20402402356² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 193276 + ... + 279571.

It is an arithmetic number, because the mean of its divisors is an integer number (900302592).

Almost surely, 2^20402402356 is an apocalyptic number.

It is an amenable number.

20402402356 is an abundant number, since it is smaller than the sum of its proper divisors (22812122060).

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

20402402356 is a wasteful number, since it uses less digits than its factorization.

20402402356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472948 (or 472946 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 20402402356 its reverse (65320420402), we get a palindrome (85722822758).

The spelling of 20402402356 in words is "twenty billion, four hundred two million, four hundred two thousand, three hundred fifty-six".