20356740477 has 32 divisors (see below), whose sum is σ = 30939269760. Its totient is φ = 13223813760.

The previous prime is 20356740451. The next prime is 20356740497. The reversal of 20356740477 is 77404765302.

20356740477 is a `hidden beast` number, since 2 + 0 + 3 + 567 + 40 + 47 + 7 = 666.

It is not a de Polignac number, because 20356740477 - 2¹² = 20356736381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356740407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118473 + ... + 233985.

It is an arithmetic number, because the mean of its divisors is an integer number (966852180).

Almost surely, 2^20356740477 is an apocalyptic number.

20356740477 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20356740477 is a deficient number, since it is larger than the sum of its proper divisors (10582529283).

20356740477 is a wasteful number, since it uses less digits than its factorization.

20356740477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115690 (or 115684 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 45.

The spelling of 20356740477 in words is "twenty billion, three hundred fifty-six million, seven hundred forty thousand, four hundred seventy-seven".