20674901478 has 128 divisors (see below), whose sum is σ = 51990626304. Its totient is φ = 5324774400.

The previous prime is 20674901461. The next prime is 20674901519. The reversal of 20674901478 is 87410947602.

It is a super-2 number, since 2×20674901478² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53981275 + ... + 53981657.

It is an arithmetic number, because the mean of its divisors is an integer number (406176768).

Almost surely, 2^20674901478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20674901478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25995313152).

20674901478 is an abundant number, since it is smaller than the sum of its proper divisors (31315724826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20674901478 is a wasteful number, since it uses less digits than its factorization.

20674901478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090.

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 20674901478 in words is "twenty billion, six hundred seventy-four million, nine hundred one thousand, four hundred seventy-eight".