20434947948 has 72 divisors (see below), whose sum is σ = 53959515792. Its totient is φ = 6761885184.

The previous prime is 20434947947. The next prime is 20434947979. The reversal of 20434947948 is 84974943402.

20434947948 is a `hidden beast` number, since 2 + 0 + 43 + 494 + 79 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 20434947894 and 20434947903.

It is not an unprimeable number, because it can be changed into a prime (20434947947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56436 + ... + 209892.

Almost surely, 2^20434947948 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20434947948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26979757896).

20434947948 is an abundant number, since it is smaller than the sum of its proper divisors (33524567844).

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

20434947948 is a wasteful number, since it uses less digits than its factorization.

20434947948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153613 (or 153599 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 20434947948 in words is "twenty billion, four hundred thirty-four million, nine hundred forty-seven thousand, nine hundred forty-eight".