20400213424 has 20 divisors (see below), whose sum is σ = 40444610536. Its totient is φ = 9962894592.

The previous prime is 20400213391. The next prime is 20400213433. The reversal of 20400213424 is 42431200402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20400213395 and 20400213404.

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, 14825049 + ... + 14826424.

Almost surely, 2^20400213424 is an apocalyptic number.

It is an amenable number.

20400213424 is a deficient number, since it is larger than the sum of its proper divisors (20044397112).

20400213424 is a wasteful number, since it uses less digits than its factorization.

20400213424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29651524 (or 29651518 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20400213424 its reverse (42431200402), we get a palindrome (62831413826).

The spelling of 20400213424 in words is "twenty billion, four hundred million, two hundred thirteen thousand, four hundred twenty-four".