1954198020 has 24 divisors (see below), whose sum is σ = 5471754624. Its totient is φ = 521119456.

The previous prime is 1954198019. The next prime is 1954198021. The reversal of 1954198020 is 208914591.

It is an interprime number because it is at equal distance from previous prime (1954198019) and next prime (1954198021).

It is a self number, because there is not a number n which added to its sum of digits gives 1954198020.

It is not an unprimeable number, because it can be changed into a prime (1954198021) 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, 16284924 + ... + 16285043.

It is an arithmetic number, because the mean of its divisors is an integer number (227989776).

Almost surely, 2^1954198020 is an apocalyptic number.

1954198020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1954198020 is an abundant number, since it is smaller than the sum of its proper divisors (3517556604).

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

1954198020 is a wasteful number, since it uses less digits than its factorization.

1954198020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32569979 (or 32569977 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1954198020 is about 44206.3119927460. The cubic root of 1954198020 is about 1250.2288690260.

The spelling of 1954198020 in words is "one billion, nine hundred fifty-four million, one hundred ninety-eight thousand, twenty".