20449861377 has 8 divisors (see below), whose sum is σ = 29745252960. Its totient is φ = 12393855360.

The previous prime is 20449861309. The next prime is 20449861379. The reversal of 20449861377 is 77316894402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20449861377 - 2⁸ = 20449861121 is a prime.

It is a super-2 number, since 2×20449861377² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20449861379) 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, 309846352 + ... + 309846417.

It is an arithmetic number, because the mean of its divisors is an integer number (3718156620).

Almost surely, 2^20449861377 is an apocalyptic number.

It is an amenable number.

20449861377 is a deficient number, since it is larger than the sum of its proper divisors (9295391583).

20449861377 is a wasteful number, since it uses less digits than its factorization.

20449861377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619692783.

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 20449861377 in words is "twenty billion, four hundred forty-nine million, eight hundred sixty-one thousand, three hundred seventy-seven".