20957541478 has 16 divisors (see below), whose sum is σ = 31568518800. Its totient is φ = 10434727936.

The previous prime is 20957541467. The next prime is 20957541487. The reversal of 20957541478 is 87414575902.

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, 3234450 + ... + 3240922.

It is an arithmetic number, because the mean of its divisors is an integer number (1973032425).

Almost surely, 2^20957541478 is an apocalyptic number.

20957541478 is a deficient number, since it is larger than the sum of its proper divisors (10610977322).

20957541478 is a wasteful number, since it uses less digits than its factorization.

20957541478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13031.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 20957541478 in words is "twenty billion, nine hundred fifty-seven million, five hundred forty-one thousand, four hundred seventy-eight".