20630400406 has 16 divisors (see below), whose sum is σ = 38581528320. Its totient is φ = 8037818280.

The previous prime is 20630400389. The next prime is 20630400419. The reversal of 20630400406 is 60400403602.

It is a super-3 number, since 3×20630400406³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 66981666 + ... + 66981973.

It is an arithmetic number, because the mean of its divisors is an integer number (2411345520).

Almost surely, 2^20630400406 is an apocalyptic number.

20630400406 is a deficient number, since it is larger than the sum of its proper divisors (17951127914).

20630400406 is a wasteful number, since it uses less digits than its factorization.

20630400406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133963659.

The product of its (nonzero) digits is 3456, while the sum is 25.

The spelling of 20630400406 in words is "twenty billion, six hundred thirty million, four hundred thousand, four hundred six".