20400604521 has 16 divisors (see below), whose sum is σ = 29887092480. Its totient is φ = 12275050320.

The previous prime is 20400604519. The next prime is 20400604583. The reversal of 20400604521 is 12540600402.

It is not a de Polignac number, because 20400604521 - 2¹ = 20400604519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20400604491 and 20400604500.

It is not an unprimeable number, because it can be changed into a prime (20400604501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2219155 + ... + 2228328.

It is an arithmetic number, because the mean of its divisors is an integer number (1867943280).

Almost surely, 2^20400604521 is an apocalyptic number.

It is an amenable number.

20400604521 is a deficient number, since it is larger than the sum of its proper divisors (9486487959).

20400604521 is a wasteful number, since it uses less digits than its factorization.

20400604521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4447636.

The product of its (nonzero) digits is 1920, while the sum is 24.

The spelling of 20400604521 in words is "twenty billion, four hundred million, six hundred four thousand, five hundred twenty-one".