20125656406 has 16 divisors (see below), whose sum is σ = 31784805360. Its totient is φ = 9530969760.

The previous prime is 20125656401. The next prime is 20125656407. The reversal of 20125656406 is 60465652102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125656401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108100 + ... + 227896.

It is an arithmetic number, because the mean of its divisors is an integer number (1986550335).

Almost surely, 2^20125656406 is an apocalyptic number.

20125656406 is a deficient number, since it is larger than the sum of its proper divisors (11659148954).

20125656406 is a wasteful number, since it uses less digits than its factorization.

20125656406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124239.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 20125656406 in words is "twenty billion, one hundred twenty-five million, six hundred fifty-six thousand, four hundred six".