20434947946 has 24 divisors (see below), whose sum is σ = 35913447360. Its totient is φ = 8694823032.

The previous prime is 20434947901. The next prime is 20434947947. The reversal of 20434947946 is 64974943402.

It is a junction number, because it is equal to n+sod(n) for n = 20434947893 and 20434947902.

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 11 ways as a sum of consecutive naturals, for example, 736450 + ... + 763693.

It is an arithmetic number, because the mean of its divisors is an integer number (1496393640).

Almost surely, 2^20434947946 is an apocalyptic number.

20434947946 is a deficient number, since it is larger than the sum of its proper divisors (15478499414).

20434947946 is a wasteful number, since it uses less digits than its factorization.

20434947946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500298 (or 1500291 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 52.

The spelling of 20434947946 in words is "twenty billion, four hundred thirty-four million, nine hundred forty-seven thousand, nine hundred forty-six".