20445402102 has 8 divisors (see below), whose sum is σ = 40890804216. Its totient is φ = 6815134032.

The previous prime is 20445402097. The next prime is 20445402119. The reversal of 20445402102 is 20120454402.

It is a happy number.

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

20445402102 is an admirable number.

It is a super-2 number, since 2×20445402102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703783503 + ... + 1703783514.

It is an arithmetic number, because the mean of its divisors is an integer number (5111350527).

Almost surely, 2^20445402102 is an apocalyptic number.

20445402102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20445402102 is a wasteful number, since it uses less digits than its factorization.

20445402102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3407567022.

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

Adding to 20445402102 its reverse (20120454402), we get a palindrome (40565856504).

The spelling of 20445402102 in words is "twenty billion, four hundred forty-five million, four hundred two thousand, one hundred two".