20404424425 has 72 divisors (see below), whose sum is σ = 33798327840. Its totient is φ = 12050035200.

The previous prime is 20404424419. The next prime is 20404424431. The reversal of 20404424425 is 52442440402.

It is an interprime number because it is at equal distance from previous prime (20404424419) and next prime (20404424431).

It is not a de Polignac number, because 20404424425 - 2⁷ = 20404424297 is a prime.

It is a super-2 number, since 2×20404424425² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 216177 + ... + 295873.

It is an arithmetic number, because the mean of its divisors is an integer number (469421220).

Almost surely, 2^20404424425 is an apocalyptic number.

20404424425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20404424425 is a deficient number, since it is larger than the sum of its proper divisors (13393903415).

20404424425 is a wasteful number, since it uses less digits than its factorization.

20404424425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79751 (or 79739 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 31.

Adding to 20404424425 its reverse (52442440402), we get a palindrome (72846864827).

The spelling of 20404424425 in words is "twenty billion, four hundred four million, four hundred twenty-four thousand, four hundred twenty-five".