20408220478 has 16 divisors (see below), whose sum is σ = 31337377920. Its totient is φ = 9964719000.

The previous prime is 20408220463. The next prime is 20408220491. The reversal of 20408220478 is 87402280402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554868 + ... + 590503.

It is an arithmetic number, because the mean of its divisors is an integer number (1958586120).

Almost surely, 2^20408220478 is an apocalyptic number.

20408220478 is a deficient number, since it is larger than the sum of its proper divisors (10929157442).

20408220478 is a wasteful number, since it uses less digits than its factorization.

20408220478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145583.

The product of its (nonzero) digits is 57344, while the sum is 37.

The spelling of 20408220478 in words is "twenty billion, four hundred eight million, two hundred twenty thousand, four hundred seventy-eight".