20429855970 has 64 divisors (see below), whose sum is σ = 50257912320. Its totient is φ = 5311872000.

The previous prime is 20429855951. The next prime is 20429855977. The reversal of 20429855970 is 7955892402.

It is not an unprimeable number, because it can be changed into a prime (20429855977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2565495 + ... + 2573445.

It is an arithmetic number, because the mean of its divisors is an integer number (785279880).

Almost surely, 2^20429855970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20429855970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25128956160).

20429855970 is an abundant number, since it is smaller than the sum of its proper divisors (29828056350).

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

20429855970 is a wasteful number, since it uses less digits than its factorization.

20429855970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10091.

The product of its (nonzero) digits is 1814400, while the sum is 51.

The spelling of 20429855970 in words is "twenty billion, four hundred twenty-nine million, eight hundred fifty-five thousand, nine hundred seventy".